~~Title: Buttons and Functions~~
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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 [[~labels|label]] can be dynamically generated using the **@label** modifier.
  * The [[~icons|icon]] can be dynamically modified using the **@icon** and related modifiers.
  * The button [[~tooltips|tooltip]] can be generated using an evaluation expression.
  * Button [[~dynamic_state|states]] like enabled/disabled, hidden/shown and checked/unchecked can be modified using the evaluator.
  * [[~conditional_behavior|Conditional behavior]] in buttons using **@if** and **@ifset** can be performed using the evaluator.
  * The **[[~evaluation_clauses|@eval]]** modifier lets you run a line of evaluator code as part of a function.
  * The return value of an evaluator expression can be [[~insertion_code|inserted]] into a command line using the `{= ... =}` code.
  * The evaluator can be used to generate a [[~commands|command line]] that's then executed as if it were part of the function.