Ok, just for the records: I tried to do it with TWinForm.CreateParented(ParentWindow: hwnd), but I get an access violation. So that does not work.
I think ParentWindow is very widgetset specific (see below). Probably
it will work cross platform very limited.
Ok, thanks for the information. I'm willing to find a cross platform solution, so I don't necessary need to go that ParentWindow road.
Solution:
It is probably easier to create a wrapper TWinControl / TCustomForm
with the ability to use the foreign Handle.
I just had a look at the wincontrol.inc and I already found this:

{------------------------------------------------------------------------------
 TWinControl CreateParentedControl
------------------------------------------------------------------------------}
class function TWinControl.CreateParentedControl(ParentWindow: hwnd): TWinControl;
begin
 // ToDo
 Result:=nil;
end;

Is this what you thought of? I mean it's still pretty "ToDo", but I guess the structure is already there. Now all I need to do is fill it with live. Any ideas?

   Christian

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