How to add floating and dockable menus?

Question

Hi there, how can I add floating and dockable menus like the ones VS has?
[img]http://i1054.photobucket.com/albums/s485/kvokvo/pawntexture2_zps912e199a.png[/img]
I've tried SplitContainer, but it can't really be dragged accross the window. ToolStripContainer only works for MenuStrip, ToolStrip and StatusStrip, none of which being able to contain the controls I need, like say, ComboBox, RadioButton, CheckBox. And none of the other containers (GroupBox, Panel, etc.) can be dragged at all.
So how can I add such menus? Thanks in advance.