To change a push button's label or the debugger command associated with
  a push button:

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

  2.  Click on the push button in the control panel of the dialog box.

  3.  If changing the push button label, enter the new label in the Label
      field or choose a predefined icon from the Icon menu.  (If changing
      the push button label, verify that the Icon menu is set to None.)

  4.  If changing the command associated with the push button, enter the
      new command in the Command field.

      If the command is to operate on a name or language expression
      selected in a window, include %s in the command name.  For example,
      the following command displays the current value of the variable
      whose name is currently selected:

      EXAMINE %s

      If the command is to operate on a name that has a a percent sign
      (%) as the first character, specify two percent signs.

  5.  Click on Modify.  The push button is modified in the dialog box
      control panel.

  6.  Click on OK.  The push button is modified in the push-button view
      on the main window.