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Functions (such as those you add to toolbar buttons or hotkeys) can use the evaluator in a number of ways:
The can be dynamically generated using the @label modifier.
The can be dynamically modified using the @icon and related modifiers.
The button can be generated using an evaluation expression.
Button like enabled/disabled, hidden/shown and checked/unchecked can be modified using the evaluator.
in buttons using @if and @ifset can be performed using the evaluator.
The modifier lets you run a line of evaluator code as part of a function.
The return value of an evaluator expression can be into a command line using the {= ... =}
code.
The evaluator can be used to generate a that's then executed as if it were part of the function.