[Closed] Creating Dockable UI or new Extended Viewports using .NET

The following is an example from max’s help:

public class TestAction : CuiDockableContentAdapter
{
public override string ActionText { get { return “Test”; } }
public override string Category { get { return “CuiTest”; } }
public override Type ContentType
{
get { return typeof(TestControl);
}

  public override object CreateDockableContent() 
  { 
    return new TestControl(); 
  } 

  public override DockStates.Dock DockingModes 
  { 
    get 
       { 
        return DockStates.Dock.Left | DockStates.Dock.Right | DockStates.Dock.Floating | DockStates.Dock.Viewport; 
       } 
  }

}

It seems that many people do not understand the specific use, and neither do I. I tested and tested, and it can only dock in one window, We hope it to be like “cui.RegisterDialogBar” in the Maxscript , Turns a window into a toolbar docked in max Instead of docking the control in a window, I’m not using it properly? Hope for expert help
thank you!