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I need to get hold of the PropertyValue which corresponds to a cell inside CExtPropertyGrid. I’d need it from inside an OnButtonPressed overriden method.
I made this code and I also tested it some, but I’d like to know if it is a safe code.

void CMyCellInPropGrid::OnButtonPressed(
	CExtGridWnd & wndGrid,
	INT nButtonType,
	const RECT & rcCellExtra,
	const RECT & rcCell,
	LONG nVisibleColNo,
	LONG nVisibleRowNo,
	LONG nColNo,
	LONG nRowNo,
	INT nColType,
	INT nRowType
	)
{
	CExtGridCellString::OnButtonPressed(...);
	if ( nButtonType == __EBTT_ELLIPSIS ) {
		CExtPropertyGridWnd *pPropGrid = reinterpret_cast<CExtPropertyGridWnd *>(&wndGrid);
		HTREEITEM hItem = pPropGrid->ItemGetByVisibleRowIndex(nRowNo);
		CMyPropValue *pValue = (CMyPropValue *)pPropGrid->PropertyItemFromTreeItem(hItem);
		// here would come other code using pValue
	}
}

Of course I only use CMyCellInPropGrid from inside CMyPropValue’s constructor:
CMyCellInPropGrid *pCell = STATIC_DOWNCAST( CMyCellInPropGrid , ValueDefaultGetByRTC( RUNTIME_CLASS( CMyCellInPropGrid ) ) );

Thank you,
Chris.

The source code is absolutely correct. All the method invocations will always return the correct result (i.e. you should never get NULL pointers nor NULL values of HTREEITEM handles).