To add a new push button to the push-button view and assign a debugger
  command to that push button:

  1.  Choose Customize Buttons...  from the Options menu on the main
      window.  The Customize dialog box appears.

  2.  Enter the debugger command for that push button in the Command
      field.

  3.  Enter a label for that push button in the Label field or choose a
      predefined icon from the Icon menu.

  4.  Click on Add.  The push button is added to the control panel within
      the dialog box.

  5.  Click on OK.  The push button is added to the push-button view in
      the main window.

  If you are debugging programs written in C or C++, you may want to add
  a new push button to the push button view, one that monitors a
  dereferenced value.  If so, you enter the following command in the
  Command field of the Customize dialog box:

         monitor *%s