Removes all previously set mappings for a particular Client button.
where buttonName is one of:
After you execute the command, the button is removed immediately from the button bar to which it applies but not from the mapping file (ui.xml or uimore.xml) if it was specified there. A restart of the Client restores any mappings you remove with clearButton, if they were in the ui.xml or uimore.xml file.
See also the mapButton command.