update_view 

Calling the flush method only updates the automation queue if the queue contains return values.

If you have a queue with no return values, and want to ensure that it is synchronized, you can use the Control Framework method CL_GUI_CFW=>UPDATE_VIEW . You should only use this method if you absolutely need to update the GUI. For example, you might have a long-running application in which you want to provide the user with regular updates on the status of an action.

CALL METHOD cl_gui_cfw=>update_view
               EXCEPTIONS CNTL_SYSTEM_ERROR = 1
                         CNTL_ERROR        = 2.