Enables a Help combo box that is located on the right side of the menu bar.
The Help combo box resembles the Help combo box in the menu bar of Microsoft Word.
When you call this method with uiID set to 0, this method hides the combo box. Otherwise, this method displays the combo box automatically on the right side of your menu bar. After you call this method, call CMFCMenuBar::GetHelpCombobox to obtain a pointer to the inserted CMFCToolBarComboBoxButton object.