Find resource from Generic.xaml programmatically

Question

I am trying to implement Style Binding from this article in WPF & Silverlight .

I have a resource dictionary, generic.Xaml with this code:

<ResourceDictionary 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

   <ResourceDictionary.MergedDictionaries>
       <ResourceDictionary Source="/AComponent;component/Themes/MyCustomStyles.xaml" />
   </ResourceDictionary.MergedDictionaries>

Where MyCustomStyles.xaml begins like this

<ResourceDictionary 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

   <t:ThemeColorProvider x:Key="ThemeProvider"/>

I need to get the instance of ThemeProvider to update colors/brushes that I am binding to in Generic.xaml. Is it possible to get the instance of the resource keyed "ThemeProvider" so I can update it?

Extra credit if you know a cross platform WPF & Silverlight implementation!

Note: I need to get this outside of the assembly that declares Generic.xaml

Answer 1

If your resource is defined in generic.xaml or any resource that is defined in MergedDictionaries in App.xaml then you need to use Application.Current.Resources, eg:

BackgroundColor = (Color)Application.Current.Resources["ApplicationBarBackgroundColor"]

Answer 2

This may help:

ThemeColorProvider value= (ThemeColorProvider)FindResource("ThemeProvider");
// update value