c# - XAML Binding to Element in a style -

i adding entitycontrol edgecontrol. edgecontrol contains element named part_edgepath. trying bind element within entitycontrol:

<usercontrol x:class="ui.graph.entitycontrol" ... >  <ellipse width="15" height="15"  fill="blue">     <ellipse.rendertransform>         <transformgroup>             <translatetransform x="-7.5" y="-7.5" />             <!-- use radius shift circle path -->             <translatetransform x:name="animatedtranslatetransform"/>         </transformgroup>     </ellipse.rendertransform>     <ellipse.triggers>         <eventtrigger routedevent="binding.targetupdated">             <beginstoryboard>                 <storyboard repeatbehavior="forever" >                     <doubleanimationusingpath                                             source="x" duration="{binding path=duration}"                                             storyboard.targetproperty="x"                                              storyboard.targetname="animatedtranslatetransform"                                             pathgeometry="{binding elementname=part_edgepath, path=data, mode=oneway, notifyontargetupdated=true, converter={staticresource geometrytopathgeometry}}"/>                     <doubleanimationusingpath                                             source="y" duration="{binding path=duration}"                                             storyboard.targetproperty="y"                                             storyboard.targetname="animatedtranslatetransform"                                             pathgeometry="{binding elementname=part_edgepath, path=data, mode=oneway, notifyontargetupdated=true, converter={staticresource geometrytopathgeometry}}"/>                 </storyboard>             </beginstoryboard>         </eventtrigger>     </ellipse.triggers> </ellipse>  </usercontrol> 

the source element located in contenttemplate in style. worked when had entitycontrol inside style well:

<resourcedictionary ... >  <!-- edge control --> <style targettype="{x:type gxl:edgecontrol}">     <setter property="template">         <setter.value>             <controltemplate targettype="{x:type gxl:edgecontrol}">                 <canvas x:name="edgecanvas">                     <path stroke="{templatebinding foreground}"                       strokethickness="2" minwidth="1" minheight="1"                       tooltip="{templatebinding tooltip}"                         x:name="part_edgepath"/>                     <path stroke="{templatebinding foreground}"                       strokethickness="2" minwidth="1" minheight="1"                          x:name="part_edgearrowpath"/>                       <!-- here entitycontrol part of style -->                     <!--<ellipse ... />-->                  </canvas>             </controltemplate>         </setter.value>     </setter> </style> </resourcedictionary> 

i create entitycontrol in code programmatically:

entitycontrol entity = new entitycontrol(); canvas canvas = visualtreehelper.getchild(edgecontrol, 0) canvas; canvas.children.add(entity); entity.initializecomponent(); entity.updatelayout(); 

unfortunately doubleanimationusingpath.pathgeometry of entitycontrol empty. tried many things make work failed. clarification why doesn't work , how could/should make work highly appreciated!

thanks!