ActionScript 3.0 :: How To Make Movie Clip Disable

i have make a movie clip button and function it if i roll over ,my object will fellow my mouse, Roll out my object will go away

movie Clip Name(Rb)

and mouse up my object will

object.x+=10
object.y+=10

but my movie clip button still work ! if i accidents Roll over the movie clip button ,my object will fellow my mouse again

i wanted to disable my moiveClip button,any can teach me how ? like

var Rb=true
function objectMoving(event:Event):void{
Rb=false
object.x+=10
object.y+=10
}