.net - WPF: How to make Contextmenu select and forget? -

i have contextmenu listbox inside. whenever right click control , select value contextmenu last selected value stays marked , can't select value again.

the idea is, may select same value within contextmenu in order turn property on or off.

should quite basic, missing?

many thanks,

edit: responses. have tried apply ideas without success. think major problem menuitems of contextmenu have no itemsource bound collection (e.g. possiblevalues in example).

may insert code clarification:

    <border.contextmenu>       <contextmenu>        <contextmenu.itemcontainerstyle>          <style targettype="{x:type menuitem}">            <setter property ="template">              <setter.value>                 <controltemplate targettype="{x:type menuitem}">                   <contentpresenter x:name="header" contentsource="header" recognizesaccesskey="true"/>                 </controltemplate>              </setter.value>            </setter>          </style>        <contextmenu.itemcontainerstyle>        <listbox borderthickness="0" width="35" margin="0"                 selecteditem="{binding path=volume, mode=twoway}                 datacontext="{binding relativesource={relativesource templatedparent}, path=datacontext}"                  itemssource="{binding path=possiblevalues}"/>        </contextmenu>     </border.contextmenu> 

why have listbox in contextmenu? listbox allows select 1 item out of list (or multiple items, if enabled). example list of files in explorer.

a contextmenu itemscontrol, ie. can add arbitrary number of items it. add items directly.

edit: both contextmenu , menuitem itemscontrol. both have itemssource property. have following:

<contextmenu     datacontext="{binding relativesource={relativesource templatedparent}, path=datacontext}"     itemssource="{binding path=possiblevalues}"/> 

possiblevalues collection of menuitems. each menuitem @ follows (here in code), example:

var menuitem = new menuitem(); menuitem.items.add(new textblock { text = "something" }); menuitem.command = dosomethingcommand; menuitem.commandparameter = "identifier"; 

edit2: try following. command use 1 of many implementations mvvm helper libraries, such delegatecommand<> prism or simplecommand cinch.

possiblevalues = new observablecollection<menuitem>();  // null value var nullmenuitem = new menuitem(); nullmenuitem.items.add(new textblock { text = "null" }); nullmenuitem.command = dosomethingcommand; nullmenuitem.commandparameter = null; possiblevalues.add(nullmenuitem);  // values 1 9 (int = 1; < 9; i++) {     var menuitem = new menuitem();     menuitem.items.add(new textblock { text = i.tostring() });     menuitem.command = dosomethingcommand;     menuitem.commandparameter = i;     possiblevalues.add(menuitem); } 

as execute handler of command, along lines of:

public void dosomethingcommand_execute(object commandparameter) {     this.selectednumber = commandparameter int?;     // or whatever want in response selection. }