[lazarus] Patch: combobox (and other controls) top position

[Micha Nelissen]

Hi,

Attached is a patch to fix top position of controls (especially 
TComboBox) in TGroupBoxes.

Also fixes some AV's because I noticed that sometimes in 
DestroyComponent the Handle is recreated, ie. CreateWnd is called on the 
same control. I fixed it by removing 'Lazarus' from the property list so 
the callback doesn't see it anymore.

Regards,

Micha.

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