how i obtain coordinates comparison vigilant enclosing wpf listview

i wish arrangement wpf elements circuitously comparison vigilant listview. i obtain coordinates (screen relative) comparison listviewitem?

<listview 
    x:name="techschoollistview"
    cliptobounds="false"
    width="auto" height="auto" 
    horizontalcontentalignment="stretch" 
    verticalcontentalignment="top" 
    itemtemplate="{dynamicresource techschooldatatemplate}" 
    itemssource="{binding path=techschoolresearchlist, mode=default}" 
    selectedindex="1"
    selectedvalue="{binding path=selectedtechschool, mode=default}" 
    selectionchanged="techschoollist_selectionchanged" 
    itemcontainerstyle="{dynamicresource techschoolitemcontainerstyle}" 
    scrollviewer.cancontentscroll="false" 
    scrollviewer.verticalscrollbarvisibility="disabled" >
    <listview.background>
        <solidcolorbrush color="{dynamicresource panelbackgroundcolor}"/>
    </listview.background>
</listview>