// Function: OnCommand
// Handles WM_COMMAND messages (Menu, toolbar, etc)
void MainWindow::OnCommand(HWND hwnd, int id, HWND hCtl, UINT codeNotify)
{
	switch(id)
	{
	case IDM_FILE_EXIT:
		PostQuitMessage(0);
		break;

	case IDM_FILE_CLEAR:
		InvalidateRect(hwnd, &Recto, FALSE);
		InvalidateRect(hwnd, &Recto, TRUE);
		break;

	case IDM_HELP_ABOUT:
		AboutDialog* dlg = new AboutDialog();
		dlg->Run(m_hInstance, hwnd);
		delete dlg; 
		dlg = NULL;
		break;
	}
}