When can I dispose an IDisposable WPF control e.g. WindowsFormsHost?

Question

The WPF control WindowsFormsHost inherits from IDisposable.

If I have a complex WPF visual tree containing some of the above controls what event or method can I use

Answer 1

WPF Controls don't implement the IDisposable interface, because they have nothing to dispose (No handles to clean up, no unmanaged memory to release). All you need to do is make sure that you don't have any references to the controls and the GC will clean them.

Therefore WPF employs weak event patterns to ensure that controls can be garbage collected. This is the pattern you need to implement to ensure clean-up, not IDisposable.