Display help for dialog controls on the status bar

BOOL CAboutDlg::OnSetCursor(CWnd * pWnd, UINT nHitText, UINT message)
{
	// if the cursor is not over a child window control, revert
	// to the default status bar text

	if(pWnd == this)
		SetPaneText();
	else
		SetPaneText(pWnd->GetDlgCtrlID());

	return CDialog::OnSetCursor(pWnd, nHitTest, message);
}

void CAboutDlg::OnDestroy()
{
	SetPaneText();
	CDialog::OnDestroy();
}

// this part goes to CAboutDlg class declaration
protected:
	void SetPaneText(UINT nID = 0);

// and this is function implementation
void CAboutDlg::SetPaneText(UINT nID)
{
	if(nID == 0)
		nID = AFX_IDS_IDLEMESSAGE;

	CWnd * pWnd = AfxGetMainWnd()->GetDescendantWindow(AFX_IDW_STATUS_BAR);
	if(pWnd)
	{
		AfxGetMainWnd()->SendMessage(WM_SETMESSAGESTRING, nID);
		pWnd->SendMessage(WM_IDLEUPDATECMDUI);
		pWnd->UpdateWindow();
	}
}

#include  // for WM_SETMESSAGESTRING and WM_IDLEUPDATECMDUI
#include  // for AFX_IDW_STATUS_BAR