ActionScript 3.0 :: Moving MovieClip And Completing Loop

For some reason the x++ loop to move clip doesn't work. There must be an easy fault.
cX=iButton[i].x;
while (cX>iX) {
iButton[i].x=cX;
cX--
}

It should move a thing smoothly, as I understand it, but it doesn't. It completes the while and then shows the iButton at iX, completing the loop without showing a thing meanwhile. I even put a 1000-count for{} loop to slow it down, but it just delayed the final outcome. I also tried to move the moving to a separate function, and into a package. (It's these menus I want to slow down.)