how reinstate click eventuality mouseover silverlight 2.0 combobox?

i have combo box silverlight 2.0 i wish open user mouses over toggle symbol following tie rodent away. default function click.

here impression formula (sorry long):

<style x:key="helpcomboboxstyle" targettype="combobox">
<setter property="padding" value="0,0,0,0"/>
<setter property="background" value="#ff1f3b53"/>
<setter property="horizontalcontentalignment" value="left"/>
<setter property="borderthickness" value="1"/>
<setter property="tabnavigation" value="once"/>
<setter property="borderbrush" value="#104f9b"/>

<setter property="template">
    <setter.value>
        <controltemplate targettype="combobox">
            <grid>
                <grid.resources>
                    <style targettype="togglebutton" x:name="combotogglestyle">
                        <setter property="borderbrush" value="#104f9b"/>
                        <setter property="borderthickness" value="1"/>
                        <setter property="padding" value="3"/>
                        <setter property="template">
                            <setter.value>
                                <controltemplate targettype="togglebutton">
                                    <grid>
                                        <vsm:visualstatemanager.visualstategroups>
                                            <vsm:visualstategroup x:name="commonstates">
                                                <vsm:visualstategroup.transitions>
                                                    <vsm:visualtransition generatedduration="00:00:00.1" to="mouseover"/>
                                                    <vsm:visualtransition generatedduration="00:00:00.1" to="pressed"/>
                                                </vsm:visualstategroup.transitions>
                                                <vsm:visualstate x:name="normal"/>
                                                <vsm:visualstate x:name="mouseover">
                                                    <storyboard>
                                                        <objectanimationusingkeyframes duration="00:00:00" storyboard.targetname="popupborder" storyboard.targetproperty="(uielement.visibility)">
                                                            <discreteobjectkeyframe keytime="00:00:00">
                                                                <discreteobjectkeyframe.value>
                                                                    <visibility>visible</visibility>
                                                                </discreteobjectkeyframe.value>
                                                            </discreteobjectkeyframe>
                                                        </objectanimationusingkeyframes>
                                                    </storyboard>
                                                </vsm:visualstate>
                                                <vsm:visualstate x:name="pressed">
                                                    <storyboard>
                                                        <doubleanimationusingkeyframes storyboard.targetname="backgroundoverlay2" storyboard.targetproperty="opacity">
                                                            <splinedoublekeyframe keytime="0" value="1"/>
                                                        </doubleanimationusingkeyframes>
                                                        <doubleanimationusingkeyframes storyboard.targetname="highlight" storyboard.targetproperty="(uielement.opacity)">
                                                            <splinedoublekeyframe keytime="0" value="1"/>
                                                        </doubleanimationusingkeyframes>
                                                        <coloranimationusingkeyframes storyboard.targetname="backgroundgradient" storyboard.targetproperty="(shape.fill).(gradientbrush.gradientstops)[1].(gradientstop.color)">
                                                            <splinecolorkeyframe keytime="0" value="#e5ffffff"/>
                                                        </coloranimationusingkeyframes>
                                                        <coloranimationusingkeyframes storyboard.targetname="backgroundgradient" storyboard.targetproperty="(shape.fill).(gradientbrush.gradientstops)[2].(gradientstop.color)">
                                                            <splinecolorkeyframe keytime="0" value="#bcffffff"/>
                                                        </coloranimationusingkeyframes>
                                                        <coloranimationusingkeyframes storyboard.targetname="backgroundgradient" storyboard.targetproperty="(shape.fill).(gradientbrush.gradientstops)[3].(gradientstop.color)">
                                                            <splinecolorkeyframe keytime="0" value="#6bffffff"/>
                                                        </coloranimationusingkeyframes>
                                                        <coloranimationusingkeyframes storyboard.targetname="backgroundgradient" storyboard.targetproperty="(shape.fill).(gradientbrush.gradientstops)[0].(gradientstop.color)">
                                                            <splinecolorkeyframe keytime="0" value="#f2ffffff"/>
                                                        </coloranimationusingkeyframes>
                                                    </storyboard>
                                                </vsm:visualstate>
                                                <vsm:visualstate x:name="disabled">
                                                    <storyboard>
                                                        <doubleanimationusingkeyframes storyboard.targetname="disabledvisualelement" storyboard.targetproperty="(uielement.opacity)">
                                                            <splinedoublekeyframe keytime="0" value="1"/>
                                                        </doubleanimationusingkeyframes>
                                                    </storyboard>
                                                </vsm:visualstate>
                                            </vsm:visualstategroup>
                                            <vsm:visualstategroup x:name="checkstates"/>

                                            <vsm:visualstategroup x:name="focusstates"/>

                                        </vsm:visualstatemanager.visualstategroups>
                                        <rectangle x:name="background" fill="{templatebinding background}" stroke="{templatebinding borderbrush}" strokethickness="{templatebinding borderthickness}" />
                                        <rectangle x:name="backgroundoverlay" opacity="0" fill="#ff448dca" stroke="#00000000" strokethickness="{templatebinding borderthickness}" />
                                        <rectangle x:name="backgroundoverlay2" opacity="0" fill="#ff448dca" stroke="#00000000" strokethickness="{templatebinding borderthickness}" />
                                        <rectangle margin="{templatebinding borderthickness}" x:name="backgroundgradient" stroke="#ffffffff" strokethickness="2" >
                                            <rectangle.fill>
                                                <lineargradientbrush endpoint=".7,1" startpoint=".7,0">
                                                    <gradientstop color="#ffffffff" offset="0"/>
                                                    <gradientstop color="#f9ffffff" offset="0.375"/>
                                                    <gradientstop color="#e5ffffff" offset="0.625"/>
                                                    <gradientstop color="#c6ffffff" offset="1"/>
                                                </lineargradientbrush>
                                            </rectangle.fill>
                                        </rectangle>
                                        <rectangle x:name="backgroundoverlay3" opacity="0" fill="#ff448dca" stroke="#00000000" strokethickness="{templatebinding borderthickness}"/>
                                        <rectangle margin="{templatebinding borderthickness}" x:name="backgroundgradient2" opacity="0" stroke="#ffffffff" strokethickness="2" >
                                            <rectangle.fill>
                                                <lineargradientbrush endpoint=".7,1" startpoint=".7,0">
                                                    <gradientstop color="#ffffffff" offset="0"/>
                                                    <gradientstop color="#f9ffffff" offset="0.375"/>
                                                    <gradientstop color="#e5ffffff" offset="0.625"/>
                                                    <gradientstop color="#c6ffffff" offset="1"/>
                                                </lineargradientbrush>
                                            </rectangle.fill>
                                        </rectangle>
                                        <rectangle margin="{templatebinding borderthickness}" x:name="highlight" ishittestvisible="false" opacity="0" stroke="#ff45d6fa" strokethickness="2" />
                                        <contentpresenter horizontalalignment="{templatebinding horizontalcontentalignment}" margin="{templatebinding padding}" x:name="contentpresenter" verticalalignment="{templatebinding verticalcontentalignment}" content="{templatebinding content}" contenttemplate="{templatebinding contenttemplate}"/>
                                        <rectangle x:name="disabledvisualelement" ishittestvisible="false" opacity="0" fill="#a5ffffff" />
                                        <rectangle x:name="focusvisualelement" ishittestvisible="false" visibility="collapsed" stroke="#ff45d6fa" strokethickness="2" />
                                    </grid>
                                </controltemplate>
                            </setter.value>
                        </setter>
                    </style>
                </grid.resources>
                <vsm:visualstatemanager.visualstategroups>
                    <vsm:visualstategroup x:name="commonstates">
                        <vsm:visualstategroup.transitions>
                            <vsm:visualtransition generatedduration="00:00:00.1"/>
                            <vsm:visualtransition from="mouseover" generatedduration="00:00:00.1000000" to="normal"/>
                        </vsm:visualstategroup.transitions>
                        <vsm:visualstate x:name="normal"/>
                        <vsm:visualstate x:name="mouseover"/>
                        <vsm:visualstate x:name="disabled">
                            <storyboard>
                                <doubleanimationusingkeyframes storyboard.targetname="disabledvisualelement" storyboard.targetproperty="(uielement.opacity)">
                                    <splinedoublekeyframe keytime="00:00:00" value="1"/>
                                </doubleanimationusingkeyframes>
                            </storyboard>
                        </vsm:visualstate>
                    </vsm:visualstategroup>
                    <vsm:visualstategroup x:name="focusstates">
                        <vsm:visualstate x:name="focused">
                            <storyboard>
                                <doubleanimationusingkeyframes storyboard.targetname="focusvisualelement" storyboard.targetproperty="(uielement.opacity)">
                                    <splinedoublekeyframe keytime="00:00:00" value="1"/>
                                </doubleanimationusingkeyframes>
                            </storyboard>
                        </vsm:visualstate>
                        <vsm:visualstate x:name="unfocused"/>
                        <vsm:visualstate x:name="focuseddropdown">
                            <storyboard>
                                <objectanimationusingkeyframes duration="00:00:00" storyboard.targetname="popupborder" storyboard.targetproperty="(uielement.visibility)">
                                    <discreteobjectkeyframe keytime="00:00:00">
                                        <discreteobjectkeyframe.value>
                                            <visibility>visible</visibility>
                                        </discreteobjectkeyframe.value>
                                    </discreteobjectkeyframe>
                                </objectanimationusingkeyframes>
                            </storyboard>
                        </vsm:visualstate>
                    </vsm:visualstategroup>
                </vsm:visualstatemanager.visualstategroups>
                <border x:name="contentpresenterborder">
                    <grid>                              
                        <togglebutton horizontalalignment="stretch" margin="0" x:name="dropdowntoggle"   background="white" borderbrush="{templatebinding borderbrush}" borderthickness="{templatebinding borderthickness}" horizontalcontentalignment="right">
                            <path height="8" horizontalalignment="center" margin="0,0,0,0" x:name="btnarrow" width="10" stretch="uniform" data="f1 m 301.14,-189.041l 311.57,-189.041l 306.355,-182.942l 301.14,-189.041 z ">
                                <path.fill>
                                    <solidcolorbrush color="#104f9b" x:name="btnarrowcolor"/>
                                </path.fill>
                            </path>
                        </togglebutton>
                        <contentpresenter visibility="collapsed" horizontalalignment="{templatebinding horizontalcontentalignment}" margin="{templatebinding padding}" x:name="contentpresenter" verticalalignment="{templatebinding verticalcontentalignment}">

                        </contentpresenter>
                    </grid>
                </border>
                <rectangle x:name="disabledvisualelement" ishittestvisible="false" opacity="0" fill="#a5ffffff" radiusx="3" radiusy="3"/>
                <rectangle x:name="focusvisualelement" ishittestvisible="false" opacity="0" stroke="#ff45d6fa" strokethickness="1" radiusx="3" radiusy="3"/>
                <popup x:name="popup">
                    <popup.rendertransform>
                        <translatetransform x="-125" />
                    </popup.rendertransform>
                    <border height="auto" horizontalalignment="stretch" x:name="popupborder" borderbrush="{templatebinding borderbrush}" borderthickness="{templatebinding borderthickness}" cornerradius="3">
                        <border.background>
                            <lineargradientbrush endpoint="0.5,1" startpoint="0.5,0">
                                <gradientstop color="#ffffffff" offset="0"/>
                                <gradientstop color="#fffefefe" offset="1"/>
                            </lineargradientbrush>
                        </border.background>
                        <scrollviewer x:name="scrollviewer" borderthickness="0" padding="1">
                            <itemspresenter/>
                        </scrollviewer>
                    </border>
                </popup>
            </grid>
        </controltemplate>
    </setter.value>
</setter>