Cannot automate/simulate listview click of another process

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C++

Win32

Cannot automate/simulate listview click of another process


I am developing an automation tool. I want to click listview item of another process
programatically. I have partially succeeded in doing(works with non-MFC but not working with MFC target application).I am getting a slightly different output.I used NMITEMACTIVATE(I have also used PostMessage Instead of SendMessage in the
code below).
C++,Win32
Small code detail:

NMITEMACTIVATE nmbh;
		nmbh.hdr.code = NM_DBLCLK;
		nmbh.hdr.hwndFrom=g_hWnd;
		nmbh.hdr.idFrom=GetDlgCtrlID(g_hWnd);
		nmbh.iItem=itemval;
		nmbh.iSubItem=0;
		nmbh.uNewState=0;
		nmbh.uOldState=0;
		nmbh.uChanged=0;
		nmbh.uKeyFlags=0;
	        SendMessage(GetParent(g_hWnd), WM_COPYDATA,(WPARAM)g_hWnd,(LPARAM)&nmbh);