Set property ShowHint for the RadioGroup to True, then:
...
If you have multiple RadioGroups, the above method will silence them all, but then you can play with the Tag property to enable/disable hint for a particular RadioGroup.
Thanks. Unfortunately it doesn't work for me, see my attached demo program with your solution.
Nevertheless, I have in total 58 (sic!) radio groups in my program. It would be a nightmare to handle them differently that some show a hint, some not.
In general, I need a solution in which the child of a groupbox does not show any hint, nevertheless if the groupbox itself shows a hint or not.
It seems this is not possible.
The question is now, could this be implemented to the LCL for future or not. If yes, I would like to open an enhancement issue in the bugtracker.