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I’m writing a custom control whereby it requires a specific parent for it to work.
In this case, its the Canvas panel. however where do i put the code to check that when it adds to the logical/visual tree, it throws a NotSupportedException?
Override the OnApplyTemplate method in your custom control.
If you need a specific parent to work, I would advice creating a custom items control with a specific item container control and a specific items panel instead of forcing this behavior through an exception.