How to enable context sensitive help for individual controls on a FormView

// ContextHelpView.cpp : implementation of the CContextHelpView class
//

#include "stdafx.h"
#include "ContextHelp.h"

#include "ContextHelpDoc.h"
#include "ContextHelpView.h"
#include "AfxPriv.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CContextHelpView

IMPLEMENT_DYNCREATE(CContextHelpView, CFormView)

BEGIN_MESSAGE_MAP(CContextHelpView, CFormView)
	//{{AFX_MSG_MAP(CContextHelpView)
		// NOTE - the ClassWizard will add and remove mapping macros here.
		//    DO NOT EDIT what you see in these blocks of generated code!
	//}}AFX_MSG_MAP
	// Standard printing commands
	ON_COMMAND(ID_FILE_PRINT, CFormView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_DIRECT, CFormView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_PREVIEW, CFormView::OnFilePrintPreview)
	ON_MESSAGE(WM_HELPHITTEST, OnHelpHitTest)
	ON_MESSAGE(WM_COMMANDHELP, OnCommandHelp)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CContextHelpView construction/destruction

CContextHelpView::CContextHelpView()
	: CFormView(CContextHelpView::IDD)
{
	//{{AFX_DATA_INIT(CContextHelpView)
		// NOTE: the ClassWizard will add member initialization here
	//}}AFX_DATA_INIT
	// TODO: add construction code here

}

CContextHelpView::~CContextHelpView()
{
}

void CContextHelpView::DoDataExchange(CDataExchange* pDX)
{
	CFormView::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CContextHelpView)
		// NOTE: the ClassWizard will add DDX and DDV calls here
	//}}AFX_DATA_MAP
}

BOOL CContextHelpView::PreCreateWindow(CREATESTRUCT& cs)
{
	// TODO: Modify the Window class or styles here by modifying
	//  the CREATESTRUCT cs

	return CFormView::PreCreateWindow(cs);
}

void CContextHelpView::OnInitialUpdate()
{
	CFormView::OnInitialUpdate();
	ResizeParentToFit();

}

/////////////////////////////////////////////////////////////////////////////
// CContextHelpView printing

BOOL CContextHelpView::OnPreparePrinting(CPrintInfo* pInfo)
{
	// default preparation
	return DoPreparePrinting(pInfo);
}

void CContextHelpView::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add extra initialization before printing
}

void CContextHelpView::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add cleanup after printing
}

void CContextHelpView::OnPrint(CDC* pDC, CPrintInfo* /*pInfo*/)
{
	// TODO: add customized printing code here
}

/////////////////////////////////////////////////////////////////////////////
// CContextHelpView diagnostics

#ifdef _DEBUG
void CContextHelpView::AssertValid() const
{
	CFormView::AssertValid();
}

void CContextHelpView::Dump(CDumpContext& dc) const
{
	CFormView::Dump(dc);
}

CContextHelpDoc* CContextHelpView::GetDocument() // non-debug version is inline
{
	ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CContextHelpDoc)));
	return (CContextHelpDoc*)m_pDocument;
}
#endif //_DEBUG

/////////////////////////////////////////////////////////////////////////////
// CContextHelpView message handlers
LRESULT CContextHelpView::OnHelpHitTest(WPARAM wParam, LPARAM lParam)
{
	// message is sent to us as follows:
	// dwContext = ::SendMessage(hWnd, WM_HELPHITTEST, 0, MAKELONG(point.x, point.y));
	// WPARAM = 0 ;
	// LPARAM = Point clicked

	CPoint	p((DWORD)lParam) ;

	ClientToScreen(&p) ;

	CWnd *pWnd = WindowFromPoint(p) ;
	if (pWnd != NULL)
		{
		if (pWnd == this)
			return IDD + 0x20000 ;				// convert to correct help ID
		else
			return pWnd->GetDlgCtrlID() + 0x60000 ;
		}
	return 0 ;			// failed!
}

LRESULT	CContextHelpView::OnCommandHelp(WPARAM wParam, LPARAM lParam)
{
	// message is sent to us as a test to see whether we make WinHelp appear
	// return non-zero if we process the message
	// wParam = 0, not used
	// lParam = 0, not used
	CWnd *pWnd = GetFocus();
	if (pWnd != NULL)
	{
		DWORD helpID;
		if (pWnd == this)
			helpID = IDD + 0x20000 ;				// convert to correct help ID
		else
			helpID = pWnd->GetDlgCtrlID() + 0x60000 ;
		
		// we have a control with the focus, pop-up help for it
		AfxGetApp()->WinHelp(helpID);
		return TRUE;
	}
	return FALSE;		// let default handling process it
}