Objective Grid: Adding What's this? context-sensitive help to grid elements

Problem

Can I have What's this? type context-sensitive help on a per cell basis?

You can register an user attribute in the grid (let's say IDS_UA_HELPID) and assign this help ID to cells, rows, or columns. For example,
 

To implement the What's this functionality, you have to process the WM_HELPHITTEST function which is described in MFC Technote 28.

To do this:

1. Include afxpriv.h
2. Add declaration


3.  

   afx_msg LRESULT OnHelpHitTest(WPARAM wParam, LPARAM lParam);

4. Add to message map


5.  

   ON_MESSAGE(WM_HELPHITTEST, OnHelpHitTest)

6. Implementation of this method


7.  

   	LRESULT COGLView::OnHelpHitTest(WPARAM, LPARAM lParam) {
   		CPoint ptTest(LOWORD(lParam), HIWORD(lParam)); ASSERT_VALID(this); ROWCOL nRow = CalcClientRowFromPt(ptTest); ROWCOL nCol = CalcClientColFromPt(ptTest); LRESULT nID = 0; if (nRow != GX_INVALID && nCol != GX_INVALID) {
   			TRACE(OnHelpHitTest: nRow %lu, nCol %lu , GetRow(nRow), GetCol(nCol)); CGXStyle style; ComposeStyleRowCol(GetRow(nRow), GetCol(nCol), &style); nID = atol(style.GetUserAttribute(IDS_UA_HELP));
   		} return nID;
   	}