Open tool window and dragging it, to existing Rad daocking control

Hi,

1. I want to open a tool window with content. 
2. after the tool window is shown, i want to docking it  (by dragging) to existing radDaocking control.

I saw this telerik documentation for telerik winform:
ToolWindow windowTop = new ToolWindow();
windowTop.Text = "Window Top";
RadDocking radDock1 = new RadDocking();
this.radDock1.DockWindow(windowTop, DockPosition.Top);

what is the replacement code for this sample for telerik wpf?

(i don't have windowTop.Text neither  radDock1.DockWindow(windowTop, DockPosition.Top))

Thanks