I'm trying to create a subclass of Slider which slide from one color to the
next and has a gradient brush background.
The C# code has 2 new properties: StartColor, EndColor
The XAML code is the following:
==================
<Slider x:Class="TransparencySlider.ColorSlider"
   xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
   x:Name="root">
   <Slider.Background>
 <LinearGradientBrush StartPoint="0,0" EndPoint="1,1">
  <GradientStop Color="{Binding StartColor, ElementName=root}"
Offset="0.0"/>
  <GradientStop Color="{Binding EndColor, ElementName=root}" Offset="1.0"
/>
 </LinearGradientBrush>
   </Slider.Background>
</Slider>
==================

however at runtime the gradient brush is all white and the log message (in
the output windows) is: "cannot find source element for the binding", i.e.
cannot find 'root', this slider, the control itself.

mmhh... why is that?
what should I write?
I'm running into a wall......