Hi!
I tried change text in runtime for ToolbarButton (unsuccessfully).

queryCommand: aCommandQuery
super queryCommand: aCommandQuery.
aCommandQuery command = #run
ifTrue:
[aCommandQuery text: 'bla-bla-bla'.
^true]

This code not work fot ToolBarButton.

ToolBarButton implement
>>text
^self commandDescription description

but change in runtime queryCommandDescription description:
'bla-bla-bla'
take effect only for tooltip.