wpf - Why can I not set a SolidColorBrush resource value from code? -

i have resource defined in xaml :

<core:widgetbase xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk"  x:class="....silverlight.liquidityconstraintsview"     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"     xmlns:core="clr-namespace:...silverlight;assembly=....silverlight"     xmlns:local="clr-namespace:....silverlight"     mc:ignorable="d">      <core:widgetbase.resources>         <solidcolorbrush x:key="..." />     </core:widgetbase.resources> ... 

i trying set code :

void _administrationclient_getbyfiltermodulesettingcompleted(object sender, getbyfiltermodulesettingcompletedeventargs e) {         this.resources["..."] = new solidcolorbrush(colors.red); } 

but error :

the method or operation not implemented.

stack trace :

   @ system.windows.resourcedictionary.set_item(object key, object value)    @ ....silverlight.liquidityconstraintsview._administrationclient_getbyfiltermodulesettingcompleted(object sender, getbyfiltermodulesettingcompletedeventargs e)    @ ....service.administrationserviceclient.ongetbyfiltermodulesettingcompleted(object state) 

it happens when send off request server fetch me colour, when returns try , set colour resource, fails if try , set red @ point.

if @ helps, method in setting async callback method wcf call server.

if @ setter resourcedictionary in reflector (for silverlight), you'll see throws notimplementedexception, not work in silverlight.

you try removing resource , re-adding it, that's shot in dark.