How do I ensure the frame window I create have my own chosen sizes and is positioned at my own chosen location?

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How do I ensure the frame window I create have my own chosen sizes and is positioned at my own chosen location?

Because I needed a dialogue box with split window, I decided to use a frame window, a splitter and form views.

Every thing went well except that the frame window I created would not assume the dimensions I stated and would not stay in the position I specified. It simply fills up my app's main window so that neither it nor the app,s main window are distinguishable in dimension and position.

What can I do to remedy this?

The code I used to create the frame window are shown below.

void CMainFrame::OnMyDialogue()
{
         MyDialogue *pDialog =  new MyDialogue;

	CRect rc(200,200,200,200);
	pDialog->Create(NULL,_T("Test"),WS_POPUPWINDOW,rc,this);
	
	pDialog->ShowWindow(SW_NORMAL);
	pDialog->UpdateWindow();

}

What could be wrong?


P.S.
This is the first time I am using a form view. Is it the normal way form views behave?

Do they simply fill up the entire screen?