Many have asked the question - "What do I need to customize the Floating pane and specifically how to remove the border?". There are two main things you need to do to achieve that:
1. Set the UseOSNonClientArea property of the ToolWindow to false.
You can do that in the ToolWindowLoaded event of the XamDockManager like this:
void OnToolWindowLoaded(object sender, Infragistics.Windows.DockManager.Events.PaneToolWindowEventArgs…