Listbox binding in Silverlight -

i have listbox on silverlight page, datacontext of page set instance -- testquestions, please see code below. listbox uses datatemplate , itemsource 'answers' property of page's datacontext, works fine until try bind 'showanswer', property on page's datacontext within datatemplate. no matter tried won't pick property's value.

thank help.

xaml:

<listbox itemssource="{binding path=answers, mode=twoway}"> <listbox.itemtemplate>     <datatemplate>         <radiobutton ischecked="{binding path=correct, mode=twoway}" >             <grid>                 <stackpanel visibility="{binding path=showanswer}">                     <rectangle fill="blue" visibility="{binding path=correct}" />                 </stackpanel>                 <textblock text="{binding path=answertext, mode=twoway}" textwrapping="wrap" />             </grid>         </radiobutton>     </datatemplate> </listbox.itemtemplate> 

c#:

public class answer {     private bool correct = false;     public bool correct     {         { return correct; }         set         {             correct = value;             notifypropertychanged("correct");         }     }      private string answertext = false;     public string answertext     {         { return answertext; }         set         {             answertext = value;             notifypropertychanged("answertext");          }     }  }    public class testquestions {     private observablecollection<answer> answers = new observablecollection<answer>();     public observablecollection<answer> answers     {         { return answers; }         set         {             if (answers != value)             {                 answers = value;                 notifypropertychanged("answers");             }         }     }      private bool showanswer = false;     public bool showanswer     {         { return showanswer; }         set         {             showanswer = value;             notifypropertychanged("showanswer");         }     } 

}

it looks me you're trying bind uielement.visibility boolean value. change 'showanswer' property boolean visibility property , should set.

private visibility showanswer = visibility.collapsed;  public visibility showanswer  {      { return showanswer; }      set      {          showanswer = value;          notifypropertychanged("showanswer");      }  }  

edit:

if trying bind property on datacontext of parent control, this:

name usercontrol

example:

<usercontrol x:class="mvvmlightproto.mainpage"          x:name="mainprotopage"          xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"          xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"          xmlns:d="http://schemas.microsoft.com/expression/blend/2008"          xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"          mc:ignorable="d"          height="700"          width="1200"> 

in above example, usercontrol has name of "mainprotopage", in xaml, this:

<stackpanel visibility="{binding datacontext.showanswer, elementname=mainprotopage}">