To Add a Button Assignment

Select Workspace > Button Assignments.
The Button Assignments dialog opens. The title bar identifies the open button menu.
In the Buttons group box, turn on the Ctrl, Alt, and/or Shift check boxes and select the desired logical button from the list box.
If you select a button and key combination that is already assigned, its key-in appears in the Action field and it is selected in the list of button assignments.
In the Action text box, type a key-in and press the <Enter> key.
The new button assignment appears in the list box.
To save the button assignment in the open button menu, select File > Save or File > Save As in the dialog.
If you select Save, the open button menu is overwritten. If you select Save As, the Save Button Menu As dialog opens for creating a button menu with a different name or location.
In the Button Assignments dialog, click OK.