Changing the position of a Popup window

I am having a problem in repositioning the Popup window which is also the main window of the program.

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void OnLButtonDown(UINT flags, CPoint curpos)
{
	CursorPos = curpos;
	CWnd::GetWindowRect(winrc);
}

void OnMouseMove(UINT flags, CPoint curpos)
{
	if(/*CaptnLButtonHold == true && */flags == MK_LBUTTON && CursorPos.y<30)
	{
		CWnd::SetWindowPos(NULL,winrc.left + curpos.x - CursorPos.x, winrc.top + curpos.y - CursorPos.y,100,100,SWP_NOZORDER|SWP_NOSIZE);
	}
}


The Problem is that the window keeps flickering between two positions during the OnMouseMove() calls.
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