csplitterwnd in a dialog based application

it seems csplitterwnd is designed to be used in document/view-based applications only.
but by overriding some virtual methods in a derived class, you can make splitter windows based on csplitterwnd be used in dialog based application, activex-controls using mfc:

all virtual methods that call getparentframe() in its implementation have to be overridden.
i have done this by using existing code except
- that i replaced the call to getparentframe() by a call to getparent().
- all references or pointers to cframewnd were changed to references or pointers to cwnd.

i derived a class cxsplitterwnd from the class csplitterwnd and proceeded as stated above.
then i used this class in a dialog based application in the same way as any other cwnd derived class.
for example:

class csampledialog : public cdialog
{
	... 
	cxsplitterwnd m_wndsplitter; 
	.... 
}

bool csampledlg::oninitdialog()
{ 
...
	// todo: add extra initialization here
	m_wndsplitter.createstatic(this, 1, 2);
	m_wndsplitter.createview(0,0,runtime_class(csampleview), csize(50,0), null);
	m_wndsplitter.createview(0,1,runtime_class(csampleview), csize(0,0), null); 

	crect rect = ...;
	m_wndsplitter.movewindow(&rect);
	... 
}

the sample attached is a dialog based application and demonstrates the use of cxsplitterwnd. it does
nothing useful.

this is the new class declaration:

// splitwnd.h : implementation file
// 
class cxsplitterwnd : public csplitterwnd
{
	// construction
	public:
	cxsplitterwnd() {};
	virtual ~cxsplitterwnd() {}; 

	// operations
	public: 
	// overrides
	// classwizard generated virtual function overrides
	//{{afx_virtual(cxsplitterwnd)
	//}}afx_virtual 

	// implementation
	public: 
	// these are the methods to be overridden
	virtual void starttracking(int ht); 
	virtual cwnd* getactivepane(int* prow = null, int* pcol = null);
	virtual void setactivepane( int row, int col, cwnd* pwnd = null ); 
	virtual bool oncommand(wparam wparam, lparam lparam);
	virtual bool onnotify( wparam wparam, lparam lparam, lresult* presult );
	virtual bool onwndmsg( uint message, wparam wparam, lparam lparam, lresult* presult ); 

	// generated message map functions
	protected:
	//{{afx_msg(cxsplitterwnd)
	// note - the classwizard will add and remove member functions here.
	//}}afx_msg
	declare_message_map()
};

and here the implementation file:

// splitwnd.cpp : implementation file
// 
#include "stdafx.h"
#include "splitwnd.h" 

#ifdef _debug
#define new debug_new
#undef this_file
static char this_file[] = __file__;
#endif 

// hittest return values (values and spacing between values is important)
// had to adopt this because it has module scope 
enum hittestvalue
{
	nohit = 0,
	vsplitterbox = 1,
	hsplitterbox = 2,
	bothsplitterbox = 3, // just for keyboard
	vsplitterbar1 = 101,
	vsplitterbar15 = 115,
	hsplitterbar1 = 201,
	hsplitterbar15 = 215,
	splitterintersection1 = 301,
	splitterintersection225 = 525
}; 

/////////////////////////////////////////////////////////////////////////////
// cxsplitterwnd 

begin_message_map(cxsplitterwnd, csplitterwnd)
//{{afx_msg_map(cxsplitterwnd)
// note - the classwizard will add and remove mapping macros here.
//}}afx_msg_map
end_message_map() 

cwnd* cxsplitterwnd::getactivepane(int* prow, int* pcol)
{
	assert_valid(this); 
	cwnd* pview = getfocus();
	// make sure the pane is a child pane of the splitter
	if (pview != null && !ischildpane(pview, prow, pcol))
	pview = null; 
	return pview;
} 

void cxsplitterwnd::setactivepane( int row, int col, cwnd* pwnd)
{
	// set the focus to the pane
	cwnd* ppane = pwnd == null ? getpane(row, col) : pwnd;
	ppane->setfocus();
} 

void cxsplitterwnd::starttracking(int ht)
{
assert_valid(this);
	if (ht == nohit)
		return; 
	// gethitrect will restrict 'm_rectlimit' as appropriate
	getinsiderect(m_rectlimit); 
	if (ht >= splitterintersection1 && ht <= splitterintersection225)
	{
		// split two directions (two tracking rectangles)
		int row = (ht - splitterintersection1) / 15;
		int col = (ht - splitterintersection1) % 15; 
		gethitrect(row + vsplitterbar1, m_recttracker);
		int ytrackoffset = m_pttrackoffset.y;
		m_btracking2 = true;
		gethitrect(col + hsplitterbar1, m_recttracker2);
		m_pttrackoffset.y = ytrackoffset;
	}
	else if (ht == bothsplitterbox)
	{
		// hit on splitter boxes (for keyboard)
		gethitrect(vsplitterbox, m_recttracker);
		int ytrackoffset = m_pttrackoffset.y;
		m_btracking2 = true;
		gethitrect(hsplitterbox, m_recttracker2);
		m_pttrackoffset.y = ytrackoffset; 
		// center it
		m_recttracker.offsetrect(0, m_rectlimit.height()/2);
		m_recttracker2.offsetrect(m_rectlimit.width()/2, 0);
	}
	else
	{
		// only hit one bar
		gethitrect(ht, m_recttracker);
	} 

	// steal focus and capture
	setcapture();
	setfocus(); 
	// make sure no updates are pending
	redrawwindow(null, null, rdw_allchildren | rdw_updatenow); 
	// set tracking state and appropriate cursor
	m_btracking = true;
	oninverttracker(m_recttracker);
	if (m_btracking2)
	oninverttracker(m_recttracker2);
	m_httrack = ht;
	setsplitcursor(ht);
} 

/////////////////////////////////////////////////////////////////////////////
// csplitterwnd command routing 
bool cxsplitterwnd::oncommand(wparam wparam, lparam lparam)
{
	if (cwnd::oncommand(wparam, lparam))
	return true; 
	// route commands to the splitter to the parent frame window
	return getparent()->sendmessage(wm_command, wparam, lparam);
} 

bool cxsplitterwnd::onnotify( wparam wparam, lparam lparam, lresult* presult )
{
	if (cwnd::onnotify(wparam, lparam, presult))
	return true; 
	// route commands to the splitter to the parent frame window
	*presult = getparent()->sendmessage(wm_notify, wparam, lparam);
	return true;
} 

bool cxsplitterwnd::onwndmsg(uint message, wparam wparam, lparam lparam, lresult* presult)
{ 
	// the code line below is necessary if using cxsplitterwnd in a regular dll
	// afx_manage_state(afxgetstaticmodulestate()); 
	return cwnd::onwndmsg(message, wparam, lparam, presult);

}