How to toggle form in and out of DockPane control

[richardosp]

I wish to be able to toggle the behaviour of a form by making it dockable or non-dockable.
If I start the form with a simple Show() it obviously won't dock until I call Show( dockPanel) which works fine and the form gets docked. After floating it I want to remove it from DockPanel control so that it becomes non-dockable. I have tried DockHandler.DockPanel = null but this causes the form to disappear as does trying a Show() again. Any ideas?
Thanks

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[lextm]

You should provide some code snippets/screen shots or similar to make a reproducible description of the issue.

[richardosp]

// Scorecard is : DockContent

        Scorecard sc = new Scorecard(this, null);
        sc.Show(); // non-dockable
        sc.Show(dockPanel); // dockable and docked 
        sc.Show(); // still docked
        // release from docking but form disappears completely
        sc.DockHandler.DockPanel = null;