When you make your pane floating using the MakeFloatingOnly()
you will not be able to dock it back again using drag and drop. However, this method doesn't change the context menu of the pane, you can still open the menu and check Dockable item - then you will be able to dock the pane.
I would suggest to check this help article
where it is explained how to customize the context menu.
Also when the title of the pane is double clicked, the pane is maximized. You can disable this behavior by setting ResizeMode of the ToolWindow holding the pane:
pane.GetParentToolWindow().ResizeMode = ResizeMode.NoResize;
All the best,
the Telerik team
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