ActiveX Control , Com and overlaped child windows

Revision 3
Hello again,
I have a problem with ActiveX control. I have a com (written in c#) which is a frame with few child windows. I made a c++ app which calls the COM object in a Dialog via ActiveX control

BOOL (WINAPI *m_AtlAxWinInit)();
	m_AtlAxWinInit = (BOOL (WINAPI *)(void))::GetProcAddress(hWebLib, "AtlAxWinInit");
    m_AtlAxWinInit();

	// Get the bounds for the activeX control 
	CRect rect;
	m_ActiveXarea.GetWindowRect(&rect);
	
	hAtl = ::CreateWindowEx(
			WS_EX_DLGMODALFRAME/*| WS_CLIPSIBLINGS*/, \
			TEXT("AtlAxWin"),\
			strActiveXName,\
			WS_CHILD | WS_VISIBLE | WS_CLIPCHILDREN | WS_EX_RTLREADING,\
			rect.left, rect.top, rect.right-rect.left, rect.bottom-rect.top,\
			hSelf,\
			NULL,\
			NULL,\
			NULL);
	
	if (!hAtl)
	{
		::MessageBox( NULL, TEXT("Can not load AtlAxWin!"), TEXT("Caption"), MB_OK | MB_ICONSTOP);
		throw int(106901);
	}

	HRESULT (WINAPI *m_AtlAxGetControl) (HWND h, IUnknown** pp);
	m_AtlAxGetControl = (HRESULT (WINAPI *) (HWND, IUnknown**))::GetProcAddress(hWebLib, "AtlAxGetControl");

	m_AtlAxGetControl(hAtl, &pUnk);
	HRESULT res = pUnk->QueryInterface(IID_Control,(LPVOID *) &pFunLineViewer);

This code is taken from this article How to Integrate C# Window in C++ Project

The problem i am facing is that when i undock one of the child windows from the COM Object and click on the Dialog (or the frame itself outside of the floating window ),the Dialog overlaps the floating child window

I tried with WS_CLIPCHILDREN, WS_CLIPSIBLINGS, SetWindowPos on the dialog and on the new HWND hAtl which contains the COM Object but nothing seems to work
If you have some more ideas or suggestions what to do please tell me:)

One more question: is it possible to send a message to the COM object for example minimize so it can minimize the floating windows when minimize button on the dialog is pressed?