[Lazarus] Setting a groupbox caption bold?

[Werner Pamler]

You did not say that you want to have bold caption for several controls. 
In order to "bold" all controls on a form, I use another procedure which 
is called from the OnCreate event of a form and recursively iterates 
through all controls and their children, seeks for TCustomGroupBox 
controls and calls "BoldGroup" for them. Just look at the attachment to 
see how it works; the demo contains a hierarchy of various levels of 
groupbox containers.
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