Use this static method to set the focus to a custom control.
This method is not queued in the automation queue. Instead it is sent directly to the frontend.
On a screen, only one element can have the focus, be it a control or another kind of screen element such as an input field. The element with the focus is always the one to which the last
CALL METHOD cl_gui_control=>set_focus
EXPORTING control = control
EXCEPTIONS cntl_error = 1
cntl_system_error = 2.
Object reference (TYPE REF TO cl_gui_control ) to the control on which you want to set the focus.