UIActionRequiredSelection Property

Does the action require that one or more objects are selected? The selection is validated when a user activates the action. If the criteria isn't met then the ClickEvent isn't executed. The RequiredSelection is only considered for list toolbar actions and for details toolbar actions. For a details toolbar action: if RequiredSelection != 'NoRequirement' the action is not displayed when creating a new object. RequiredSelection is not used if Location is "ContextMenu". Defaults to 'NoRequirement'.

public SelectionRequirement RequiredSelection { get; set; }