Binding an element's visibility to a toggleButton or checkBox

what preferred method binding visibility of 1 element checkbox or togglebutton's checked state?  understand need write converter return value visible or collapsed based on checkbox state, boolean -- silverlight 3 doesn't include support wpf converter.  used converter post:

http://stackoverflow.com/questions/1534208/binding-to-a-wpf-togglebuttons-ischecked-state

when try build project, xaml invalid.  'the name "booleantovisibilityconverter" not exist in namespace "http://schemas.microsoft.com/client/2007". 

<usercontrol  	xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"  	xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"  	x:class="visibilitytest.mainpage"	  	width="640" height="480">  <usercontrol.resources>  	<booleantovisibilityconverter x:key="booleantovisibilityconverter" />  </usercontrol.resources>  	<canvas x:name="layoutroot" background="white">  		<checkbox content="checkbox" name="checkbox"/>  		<rectangle fill="#ff847563" visibility="{binding ischecked, elementname=checkbox, converter={staticresource booleantovisibilityconverter}}" stroke="black" height="106" width="221" canvas.left="219" canvas.top="160"/>  	</canvas>  </usercontrol>

 and c#:

 

namespace visibilitytest  {  public class booleantovisibilityconverter : ivalueconverter {        public object convert(object value, type targettype, object parameter, cultureinfo culture) {        if (targettype == typeof(visibility)) {          var visible = system.convert.toboolean(value, culture);          if (invertvisibility)            visible = !visible;          return visible ? visibility.visible : visibility.collapsed;        }        throw new invalidoperationexception("converter can convert value of type visibility.");      }        public object convertback(object value, type targettype, object parameter, cultureinfo culture) {        throw new invalidoperationexception("converter cannot convert back.");      }        public boolean invertvisibility { get; set; }      }    }

option skip , write new click event each item want use "button," i'd keep stylistic stuff out of c# can.  i'll adding , removing these elements frequency project develops, , don't want have touch code behind every time take button out of xaml.

missing here?  should obvious?

you forgot add namespace references namespace , add namespace converter.  here should like:

 

<usercontrol  	xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"  	xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"          xmlns:local="clr-namespace:visibilitytest"  	x:class="visibilitytest.mainpage"	  	width="640" height="480">  <usercontrol.resources>  	<local:booleantovisibilityconverter x:key="booleantovisibilityconverter" />  </usercontrol.resources>  	<canvas x:name="layoutroot" background="white">  		<checkbox content="checkbox" name="checkbox"/>  		<rectangle fill="#ff847563" visibility="{binding ischecked, elementname=checkbox, converter={staticresource booleantovisibilityconverter}}" stroke="black" height="106" width="221" canvas.left="219" canvas.top="160"/>  	</canvas>  </usercontrol>

 hope trick you.

tony

Silverlight  >  Designing with Silverlight