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Let’s say I have form A that contains a panel (with many other controls in it) and a form B that it is empty.
Can I programmatically detach the panel from form A and move it in form B (and maybe back to form A)?
I know that I can change the Owner of the panel but does it work between different forms?
Update:
After some Googling I see that there is a ParentWindow property.
You can easily have something appear as if it was a panel, and also as a form, by really using a TForm for what you would have used the panel for. Then dock the form at runtime into the place where you have a blank panel left for that purpose, and undock it at runtime, by the same manner.
You can’t undock a TPanel and have it appear as a top-level form window, but you can take a top level form window and dock it in code. To get the appearance and functionality you want you must use the correct tools (TForm, in this case).
Incidentally, component libraries like Toolbar 2000 do allow floating toolbar windows based on toolbar panels, so if you really insist on having all the designtim elements remain in one form, at desigtime, you should look into how it works in Toolbar 2000. It has a lot of code in there to render the toolbar in “undocked/floating” mode, and to handle the mouse-driven docking and undocking of toolbars into toolbar docks.