The ChildUnSelect event is triggered for a composite field when the user unselects one of its child fields that is set to one of the select biases.

compositefieldname is optional if you specify the event in a field script for a composite field, or if the composite field is the frame's top form.

Use the CurFrame system variable to access these attributes. For more information, see FrameExec Class.

Usage: The ChildUnSelect event is defined for all composite fields, including the subform that is the frame's top form.

If you specify this event in the frame script without a composite field name, the ChildUnSelect event is triggered when an UnSelect event occurs on any field in the frame that is set to a select bias.

You can use the ChildUnSelect event when a child field has been unselected to track detailed select and UnSelect events separately. A field is unselected when the user selects another field, performs a Shift-select operation on a selected field, or clicks the form background (unselecting all selected fields). This event is used in visual editor applications that provide some type of a composite field canvas (usually a subform) on which the user can manipulate shapes or fields.

For example, if the user clicks the background to unselect all selected fields, a ChildUnSelect event is triggered for each field that was unselected. (To trigger a single event, rather than multiple ChildUnSelect events, each time a group of fields is unselected, use the SelectionChanged event defined for the frame.)

You can specify an UnSelect event block for a field and a ChildUnSelect event block for one or more of the enclosing composite fields for the field. OpenROAD executes the event blocks as described in Event Block Execution.