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How to use custom properties in a ControlTemplate trigger

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I have a class derived from slider which uses a custom control template and has a few added dependency properties. I would like to fire triggers within the template based on the new properties.

For example, I have a new dependency property called ThumbIsVisible which when set to false I want just the thumb portion of my slider to be hiddin. My control template looks like:

<ControlTemplate TargetType="{x:Type Slider}">
<Thumb x:Name="m_Thumb" Style="{StaticResource SliderThumbStyle}" />

I would like to add in a trigger that looks like:

<Trigger Property="ThumbIsVisible" Value="False">
<Setter TargetName="m_Thumb" Property="Visibility" Value="Collapsed" />

Right off the bat I can see this won't work as I have the control tempate's target type set to Slider. However, if I change that to say:

<ControlTemplate TargetType="{x:Type local:myCustomSlider}">

then I run into problems with the template type differing from the controls. The only way around this is to create the xaml using the local:myCustomSlider as the type instead of Slider. However, doing this causes lots of problems with VisualStudio's designer and code behind.

Does anyone know if there is a standard way to get around all of this? As a workaround I tried adding to the template's triggers via code-behind but have not been able to get that to work.

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