One<AWindow> wnd;
void OpenAWindow() {
	if (!wnd) {
		wnd = new AWindow();
		CtrlLayout(*wnd, "A Window");
		wnd->ok	<<= THISBACK(AWindowOK);
		wnd->WhenClose = wnd->cancel <<= THISBACK(AWindowClose);
		//wnd->Open(this);			
		wnd->OpenMain();
	}
	else
		wnd->TopMost(false, false);
}	
void AWindowOK() { 
	if (wnd->Accept()) { 
		// Do Something with data 
		AWindowClose();
	}
}
void AWindowClose() 	{ wnd.Clear(); }

AWindow &wnd = Single<AWindow>()