WM_COMMAND message handler not getting called in my CWinFormsControl-derived MFC class.

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Hello- I'm Using a WinForms (.NET) control within an MFC 9.0 application.

Problem: My WM_COMMAND message handler "OnStartTestMode()" is not getting called in my "CWinFormsControl<n:c>"-derived MFC class.
A "pWnd->PostMessage(WM_COMMAND, IDM_START_CMD);" is posting the WM_COMMAND message to the child control "NAnalogMeter" from the view class, in response to a menu item selection.
See the Winforms-derived control class "NAnalogMeter" below, along with the command message declaration for message map: (note: replacing the intermediate "CEnhGauge" class directly with "CWinFormsControl<>" in the code does not resolve the issue) --
----------------------------------------------------------------
NAnalogMeter.h header file:

#include "afxwinforms.h"
class CEnhGauge : public CWinFormsControl<AquaControls::AquaGauge>
{
};
/////////////////////////////////////////////////////////////////////
// NAnalogMeter window - used to show a value as a round dial/gauge instrument meter.
class NAnalogMeter : public CEnhGauge
{
	// Construction
	public:
	  NAnalogMeter (const CRect& r, CWnd *pParent );
	
	// Implementation
	public:
	     virtual ~NAnalogMeter();
	// Generated message map functions
	protected:
		//{{AFX_MSG(NAnalogMeter)
		afx_msg void OnPaint();
		afx_msg void OnSize(UINT nType, int cx, int cy);
		afx_msg BOOL OnEraseBkgnd(CDC* pDC);
		//}}AFX_MSG
		afx_msg void OnStartTestMode();
		DECLARE_MESSAGE_MAP()
};

------------------------------------------------------------------
And its implementation file, NAnalogMeter.cpp:

BEGIN_MESSAGE_MAP(NAnalogMeter, CEnhGauge)  
 //{{AFX_MSG_MAP(NAnalogMeter)
 ON_WM_PAINT()
 //}}AFX_MSG_MAP
 ON_COMMAND(IDM_START_TEST_MODE, OnStartTestMode)
END_MESSAGE_MAP()
NAnalogMeter::NAnalogMeter (const CRect& r, CWnd *pParent )
{
  BOOL bCreatedOK = this->CreateManagedControl(WS_VISIBLE | WS_CHILD //*style*/, r /*rect*/, pParent, 0 /*ID*/); // pParent is the view-class
}
void NAnalogMeter::OnStartTestMode ( )
{
	// handler code here .....
	// ***PROBLEM: This handler is NOT GETTING CALLED ***/
}

----------------------------------------------------------------
I've used Spy++ to monitor the messages to the child Winforms control in my MFC app -- I could see the WM_COMMAND message appear in the Spy++ message log for the child window, but alas my "OnStartTestMode" handler is never getting invoked.
Thank you very much for any help in resolving this.
Tom
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