are the two following problems with labels well known?
1. If ..->AddLabel is called with no -text value pair or with an empty -text
value, then ...->Change(-text => "...") won't change the Label text.
2. If -align is specified, then the background color specified
by -background will be ignored.
P.S.: Still searching for a solution to disable/enable Toolbar Buttons
on-the-fly. Are there any code snippets???