Method OnButtonClick

demo/CAdapter.h:54–60

	}

	bool OnButtonClick(EventCmd *pEvt)
	{
		SButton *pBtn = sobj_cast<SButton>(pEvt->sender);
		int iItem = pBtn->GetRoot()->GetUserData();
		SMessageBox(NULL, SStringT().Format(_T("button of %d item was clicked"), iItem), _T("haha"), MB_OK);
		return true;
	}
};