Why won't Generic.xaml work?
The first time I did some control development for Silverlight I ran into a major stumbling block, whatever I put into Generic.xaml just wasn't showing up and none of the tutorials I could find were showing anything different from what I was doing. After some digging through Silverlight with Reflector and a few forum searches show up the culprit ... "DefaultStyleKey".
I'm not sure if this was introduced into later versions of the Silverlight betas but it's certainly not mentioned in a lot of tutorials on the web. OnApplyTemplate uses this key to determine which style to look for in Generic.xaml. This allows you to create controls that inherit from your custom control but still use the same style.
For your control you'll want to override the DefaultStyleKey to the type of your object like follows.
public MyCustomControl()
{
this.DefaultStyleKey = typeof(MyCustomControl);
}
It's tempting to do something like GetType(), but that'll be different for any subclasses so stick with a known type.
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Community Blogs - Sunday, December 14, 2008
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