flex: accessing functions / components accross mxml pages

for probity lets contend i have twin flex mxml pages.

form.mxml

button.mxml

if form.mxml page following code, should work fine:

<custom:selectview dsource="{_thedata}" id="form" visible="false">
</custom:selectview>

<mx:linkbutton label="show" id="lbshow" click="form.visible=true;>
<mx:linkbutton label="show" id="lbhide" click="form.visible=false;>

but formula like:

form.mxml

 <custom:selectview dsource="{_thedata}" id="form" visible="false">
 </custom:selectview>

button.mxml

<mx:linkbutton label="show" id="lbshow" click="form.visible=true;>
<mx:linkbutton label="show" id="lbhide" click="form.visible=false;>

how i button.mxml change form.mxml

---- bit some-more sum ---

my page indeed looks this: where query:advancedsearchfields fundamentally including flex form page, i wish show/hide tradition perspective next after hunt complete.

<query:advancedsearchfields searchtype="projects" searchcategory="advanced" visible="true" id="advancedsearch" />

<custom:selectview dsource="{_searchresults}" id="sv" visible="false">