Update dx.md

Author: oblomov-dev

docs/advanced/technical/dx.md

@@ -78,10 +78,11 @@ CLASS zcl_app_input IMPLEMENTATION.
         z2ui5_cl_xml_view=>factory(
             )->input( client->_bind_edit( pa_arbgb )
             )->button( text  = 'post' press = client->_event( 'POST' ) ) ).
-    ELSEIF client->get( )-event = 'POST'.
-      client->message_box_display( |Input: { pa_arbgb }| ).
+      RETURN.
     ENDIF.
 
+      client->message_box_display( |Input: { pa_arbgb }| ).
+
   ENDMETHOD.
 ENDCLASS.
 ```