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DeleteSelected - Delete selected entries from reference (Shift+Del)

The delete selected entries action will be activated for controls referring to owning collections, only. When the data source is not a reference or relationship or when the collection does not own its instances, the action is inactive (hidden) and cannot be called.

The action may apply on any kind of list. For multi-selection lists, the action deletes all selected entries. For single selection lists or when no entry has been marked as checked (in a check box list), the action deletes the currently selected entry.

When no instance is currently selected in the data source, the action will be disabled.

When calling the action, it will delete the currently selected instance without warning or message. In order to receive a warning message before deleting an instance the GUIFramework.Query.Delete option should be set (see "Option browser").