wpf - Bind to parent control from within context menu within data template -


i'm wanting bind parent control context menu within datatemplate.

unfortunately i'm restricted .net 3.5 , can't use x:reference extension introduced in .net 4.

below example of i'm trying do

<window x:class="wpfapplication17.window1"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     xmlns:local="clr-namespace:wpfapplication17"     name="window">      <window.resources>         <datatemplate datatype="{x:type local:car}">             <rectangle width="100" height="100" fill="red">                 <rectangle.contextmenu>                     <contextmenu>                         <menuitem header="{binding colour}"/>                         <menuitem header="{binding elementname=window, path=actualwidth}"/>                     </contextmenu>                 </rectangle.contextmenu>             </rectangle>         </datatemplate>     </window.resources> </window>

but "cannot find source binding reference 'elementname=window'" error due context menu not being part of visual tree.

edit :

that works great! .. however, doesn't seem work when use composite collection such following

<window.resources>         <datatemplate datatype="{x:type local:car}">             <rectangle width="100" height="100" fill="red"                tag="{binding relativesource={relativesource ancestortype={x:type window}}}">                 <rectangle.contextmenu>                     <contextmenu>                         <contextmenu.itemssource>                             <compositecollection>                                 <menuitem header="{binding colour}"/>                                 <menuitem header="{binding path=placementtarget.tag.actualwidth, relativesource={relativesource ancestortype=contextmenu}}"/>                             </compositecollection>                         </contextmenu.itemssource>                     </contextmenu>                      <!--<contextmenu>                         <menuitem header="{binding colour}"/>                         <menuitem header="{binding path=placementtarget.tag.actualwidth, relativesource={relativesource ancestortype=contextmenu}}"/>                     </contextmenu>-->                  </rectangle.contextmenu>             </rectangle>         </datatemplate>     </window.resources>

please try this:

<datatemplate datatype="{x:type local:car}">     <rectangle width="100" height="100" fill="red"                tag="{binding relativesource={relativesource ancestortype={x:type window}}}">         <rectangle.contextmenu>             <contextmenu>                 <menuitem header="{binding colour}"/>                 <menuitem header="{binding path=placementtarget.tag.actualwidth, relativesource={relativesource ancestortype=contextmenu}}"/>             </contextmenu>         </rectangle.contextmenu>     </rectangle> </datatemplate>

see answer here too.


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