First of all, I'm the beginner of BSP Development. I used to debug the BSP Application written in MVC Style. I found that, in the method 'DO_HANDLE_EVENT', after processing the command navigation->goto_page (XXXX.do), the program go back to the method 'DO_REQUEST' again. In this 'DO_REQUEST' method, I implemented some logics that I don't want it to be executed several times. Someone please explains the sequence of calling method of this class. Thank you in advance.