windows phone 8 - ResourceDictionary with Caliburn Micro -

app.xaml  <application.resources>     <local:appbootstrapper xmlns:local="clr-namespace:kyms" x:key="bootstrapper" />     <local:localizedstrings xmlns:local="clr-namespace:kyms" x:key="localizedstrings"/>     <resourcedictionary x:key="customdictionary">         <resourcedictionary.mergeddictionaries>             <resourcedictionary source="styles/styles.xaml" />         </resourcedictionary.mergeddictionaries>     </resourcedictionary> </application.resources> 

my resource in styles/styles.xaml

<resourcedictionary     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">   <style x:key="mycolorbutton" targettype="button">    ....... </style> 

in viewmodel (use caliburn micro mvvm pattern) if call code

app.current.resources.mergeddictionaries[0]

app.current.resources.mergeddictionaries.count = 0

but not works, why?

i'm resolved

in appbootstrapper.cs i'm insert

 private void loaddictionary()     {         var dictionaries = app.current.resources.mergeddictionaries;         dictionaries.clear();          var themestyles = new resourcedictionary { source = new uri("/myassemblyname;component/styles/styles.xaml", urikind.relativeorabsolute) };         dictionaries.add(themestyles);     } 

and works!