[Lazarus] TColorDialog descendant

[Krzysztof]

Hi,

I am looking at Dialogs unit, there is TColorDialog. I would like to
inherit from this form and add extra control (TEdit). Is this
possible? Because it seems that TColorDialog is as widgetset (that
mean native for OS?) and I don't know how it works.
I wonder, If I can't create descendant, maybe then I could create own
TForm and inside create TColorDialog and then dock it to some panel
(by ManualDock methood). Extra control will be in my main form.

Regards