OnActivate event of TApplication in CBuilder

How can I control the behaviour of my application when the user presses ALT+TAB and my application becomes active? I should write code in the OnActivate Event of the TApplication object, but I don't know how I can get this event into my code. I don't want the OnActivate event of the Form object, because that one doesn't work in this case.
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Next is sceleton of code:

class TMainForm : public TForm
void __fastcall ApplicationActivate(TObject* Sender);
void __fastcall ApplicationDeactivate(TObject* Sender);

void __fastcall TMainForm::FormCreate(TObject* Sender)
Application->OnActivate = ApplicationActivate;
Application->OnDeactivate = ApplicationDeactivate;
I hope, it helps. Alex

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