change/display dialog program

Hello all,

I am using dialog program to display the records on the screen. On screen layout i declared all fields as output fields only. Now I want to add a button (change/display) on to screen so that when ever i press the button the screen has to change from display to change mode(just like the normal display/change button in se38) and vice versa so that i can edit the fields and save it again.

I would like to know if there exists any function module to do so or can some one please help me with a code.

Thanks to all in advance.