This is in part how RR is coded, certain screen trigger different things, try the supplied cmds below.
Code:
// for when entering your screen, use this cmd line as the entering button code to your app screen
// you can change the load cmd to either end, depending on if you want the music paused before or after the going into the screen
"LOAD;xxx.skin||SETVARBYCODE;MYVAR;STATUS||EVAL;RESULT;strcomp("$MYVAR$";"play")||BYVAR;RESULT;<<PAUSE"
// for when leaving your screen, use this cmd line as the exit button code.
// change the first cmd to suit your needs ESC,EXIT,CLOSE,ect....
"ESC||SETVARBYCODE;MYVAR;STATUS||EVAL;RESULT;strcomp("$MYVAR$";"pause")||BYVAR;RESULT;<<PLAY"