Grouped elements can only be deleted when the group is being edited. To delete a member select the group and then click the Edit Group button on the toolbar, then delete the member.

public static FailureDefinitionId DeletePreventedByGroup { get; }

Public Shared ReadOnly Property DeletePreventedByGroup As FailureDefinitionId
	Get

public:
static property FailureDefinitionId^ DeletePreventedByGroup {
	FailureDefinitionId^ get ();
}