Why is a control destroyed twice when it's nested in a tab control?

I've been trying to debug why closing windows forms designer is crashing visual studio and have discovered by adding开发者_如何学Go a series of message boxes that if my controls are nested inside a System::Windows::Forms::TabControl the destructor of those controls are called twice.

Is that expected behaviour and is there a way of avoiding it?

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The Dispose() method may be called more than once, there is no rule that says it isn't legal. If you do override it (implement the destructor in C++/CLI) then you have to make sure that your code is resilient to this. Very commonly done with an isDisposed field in the class.