void OCCDemo_Presentation::GetViewCenter(V3d_Coordinate& Xc, V3d_Coordinate& Yc)
{
	CMDIFrameWnd *pFrame =  (CMDIFrameWnd*)AfxGetApp()->m_pMainWnd;
	CMDIChildWnd *pChild =  (CMDIChildWnd *) pFrame->GetActiveFrame();
	COCCDemoView *pView = (COCCDemoView *) pChild->GetActiveView();
	pView->GetViewCenter(Xc,Yc);
}