Methods of the Local Controller Interface
Note All methods that can be changed - that is, methods that can be implemented by the application developer - are listed on the Methods tab of each controller. When double-clicking the method name, you switch to an ABAP Editor which enables you to implement the source code.
In addition to the changeable methods, the local interface of each controller provides several methods which can be used but whose implementations cannot be edited by the application developer. Whether these methods are available in the interface depends on the type and the implementation state of a controller.
Note Since all methods of this group cannot be changed, they are not displayed on the Methods tab of the corresponding controller. As a part of the complete interface, you can display the existing methods using the 
Display Controller Interface icon: If you click this icon, the interface of the controller you are currently working on is displayed in a separate window. You can also display the interface of any used controller. Note that for each view controller, the usage of the corresponding component controller is created automatically, since this usage is generally always appropriate.
Display Controller Interface icon: If you click this icon, the interface of the controller you are currently working on is displayed in a separate window. You can also display the interface of any used controller. Note that for each view controller, the usage of the corresponding component controller is created automatically, since this usage is generally always appropriate. (Of course, you can also display the existing methods of the local controller by double-clicking the reference type IF_.................. of the attribute WD_THIS on the Attributes tab.)