Fires when an operator selects a different radio button in a radio group, or de-selects the currently selected radio button, either by clicking with the mouse, or using the keyboard.
Definition Level form, block, or item
SELECT statements, unrestricted Built-ins, restricted Built-ins
Enter Query Mode yes
Use a When-Radio-Changed trigger to perform an action depending on the state of a radio group. (De-selecting a radio button in a radio group sets the radio group value to NULL; operators use this technique in Enter Query mode to exclude a radio group from a query.)
When an operator clicks an item in a radio group, the internal value of that item does not change until navigation is completed successfully. Thus, the When-Radio-Changed trigger is the first trigger to register the changed value of a radio group. For all navigation triggers that fire before the When-Radio-Changed trigger, the value of the radio group remains as it was before the operator navigated to it.
no effect