Open the appropriate file for editing:
Personal: HomeDirectory/.dt/dtwmrc
System-wide: /etc/dt/config/language/sys.dtwmrc
For information on creating these files, see "Workspace Manager Configuration Files".
Create the new menu:
Menu menu_name { ... }
Create or edit the button binding to display the new menu.
If the menu replaces the existing menu, edit the button binding that displays the Workspace menu.
<Btn3Down> root f.menu menu_name
If the menu is an additional menu, create a new mouse button binding. For example, the following button binding displays the menu when Shift-mouse button 3 is pressed over the backdrop:
Shift<Btn3Down> root f.menu menu_name
Choose Restart Workspace Manager from the Workspace menu.