Dynamic State

You can use the evaluator with the various command modifiers that affect the state of toolbar buttons:

• @hideif / @showif - dynamically hide or show the button

• @disableif / @enableif - dynamically disable or enable the button

• @toggle - control whether the button appears checked/selected or unchecked/unselected

Note that these modifiers can also be used without the evaluator, so to use the evaluator you must begin the expression with a = character.

The return value from the evaluation expression will be used to determine the state. The meaning depends on the modifier in question:

• @hideif - return true to hide the button, false to show it

• @showif - return true to show the button, false to hide it

• @disableif - return true to disable the button, false to enable it

• @enableif - return true to enable the button, false to disable it

• @toggle - return true if the button should be checked/selected, false otherwise