/// <summary>
/// Detaches event handler <code>fnFunction</code> from the {@link #event:changeColumnsItems changeColumnsItems} event of this <code>sap.m.P13nColumnsPanel</code>.
///
/// The passed function and listener object must match the ones used for event registration.
/// </summary>
/// <param name="fnFunction">The function to be called, when the event occurs</param>
/// <param name="oListener">Context object on which the given function had to be called</param>
/// <returns>Reference to <code>this</code> in order to allow method chaining</returns>
public extern virtual sap.m.P13nColumnsPanel detachChangeColumnsItems(sap.m.P13nColumnsPanel.ChangedColumnItemDelegate fnFunction, object oListener);
/// <summary>
/// Attaches event handler <code>fnFunction</code> to the {@link #event:changeColumnsItems changeColumnsItems} event of this <code>sap.m.P13nColumnsPanel</code>.
///
/// When called, the context of the event handler (its <code>this</code>) will be bound to <code>oListener</code> if specified, otherwise it will be bound to this <code>sap.m.P13nColumnsPanel</code> itself.
///
/// Event raised if <code>columnsItems</code> is changed or new one needs to be created in the model.
/// </summary>
/// <param name="fnFunction">The function to be called when the event occurs</param>
/// <returns>Reference to <code>this</code> in order to allow method chaining</returns>
public extern virtual sap.m.P13nColumnsPanel attachChangeColumnsItems(sap.m.P13nColumnsPanel.ChangedColumnItemDelegate fnFunction);
