Flash Map - zoom slider using moveTo; similar to Google Maps

I have a Flash Map and need to add a zoom tool similar to Google Maps. I have a zoom slider ("slider_handle) that can be dragged horizontally from 0-100:

slider_handle.onPress = function() {
      this.startDrag(false, 0, 0, 100, 0);
};
slider_handle.onRelease = function() {
      this.stopDrag();
};
slider_handle.onReleaseOutside = function() {
      this.stopDrag();
};

Then I have a function that scales the "map" MC according to the position of the slider (from 100% - 200%):

slider_handle.onEnterFrame = function(){
 _root.map._xscale = 100 + this._x;
 _root.map._yscale = 100 + this._x;
};

Finally, I have 6 invisible zoom buttons positioned along the zoom slider so you can click at 20% intervals on the slider and go directly to that zoom level without dragging the slider_handle. Because the scale function is happening onEnterFrame, changing the position of the slider_handle should affect the scale of the map MC:

btn_zoom1.onRelease = function(){
      slider_handle.moveTo(0,0);
}
btn_zoom2.onRelease = function(){
      slider_handle.moveTo(20,0);
}
btn_zoom3.onRelease = function(){
      slider_handle.moveTo(40,0);
}
btn_zoom4.onRelease = function(){
      slider_handle.moveTo(60,0);
}
btn_zoom5.onRelease = function(){
      slider_handle.moveTo(80,0);
}
btn_zoom6.onRelease = function(){
      slider_handle.moveTo(100,0);
}

Unfortunately, this last part isn't working - Clicking on these buttons has no effect on the movie. This has got to be close...can someone please point out what I'm doing wrong? Thanks!Start Free Trial