The video shows setting up the form layout for the Richtextbox Sample.
Video Steps
1) First a Panel is added to the form. Then it is docked to the right side edge of the form
2) Then the panel is re-sized. This right side pane will have all the command for the rich text box sample
3) One more panel is added to the left of the command panel.
4) This panel is asked to fill the remaining area. Later a rich text box is placed inside this Panel.