i trap the Worksheet_BeforeRightClick() event and modify the
Application.CommandBars("Cell") menu, making some of the built-in
CommandBarControls invisible and adding some new CommandBarControls ....

this technique works fine (right-clicks bring up the customized menu) EXCEPT
if a range is selected on the sheet and the right-click is on a cell in the
selected range: in this case, the default Cell menu shows up ...

the Worksheet_BeforeRightClick() event is still being triggered, and i can
still single-step through the code which modifies the Cell menu with no
errors ... programatically, nothing occurs which is any different than the
no-selection case ... but the Cell menu is unchanged from its default state
!

very bizarre behavior !