2011

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Following is the resulting Copy Link command grayed out in the Edit menu.
DIESEL string expressions are used to conditionally disable or enable a menu
or ribbon button item each time they are displayed. For example, the DIESEL
string expression in the Macros cell of the Properties pane disables the MOVE
command while any other command is active.
$(if,$(getvar,cmdactive),~)MOVE^C^C_move
The AutoLISP menucmd function can also be used to disable and enable items
from a macro or application. For examples, see
Reference Pull-Down or Shortcut
Menus
on page 288.
Mark Menu or Ribbon Button Items
You can mark a menu or ribbon button item by doing one of the following:
Beginning a command name with an exclamation point and a period (!.)
166 | Chapter 4 User Interface Customization