I was trying to figure out how I could apply multiple shader effects to a UIElement in xaml but was having problems. Then I realized I could just use a nesting approach and embed my ui element into a hierarchy of canvas elements or some other container control and apply an effect to that canvas.  I have provided an example below of how to do it in xaml ...

 -->
    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:cbx="clr-namespace:cbxSLEffects;assembly=cbxSLEffects"         
    mc:Ignorable="d"
    d:DesignHeight="552" d:DesignWidth="702" Name="rootCtrl" Loaded="rootCtrl_Loaded">