проблема с AS твином

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2 вопроса:
1. выдает ошибку, хотя все работает:

делаю
import mx.transitions.*;

this.slides_mc1.holder0.onRollOver = function (){
var tween_handler:Object = new mx.transitions.Tween(slides_mc1.holder0, "_xscale", mx.transitions.easing.Zoom, slides_mc1.holder0._xscale, 120, 2, true);
var tween_handler2:Object = new mx.transitions.Tween(slides_mc1.holder0, "_yscale", mx.transitions.easing.Zoom, slides_mc1.holder0._xscale, 120, 2, true);
};

this.slides_mc1.holder0.onRollOut = function (){
var tween_handler:Object = new mx.transitions.Tween(slides_mc1.holder0, "_xscale", mx.transitions.easing.Zoom, slides_mc1.holder0._xscale, 100, 2, true);
var tween_handler2:Object = new mx.transitions.Tween(slides_mc1.holder0, "_yscale", mx.transitions.easing.Zoom, slides_mc1.holder0._xscale, 100, 2, true);
};

ОШИБКА:
**Warning** Scene=Scene 1, layer=Layer 18, frame=1:Line 275: There is no class or package with the name 'mx.transitions.easing.Zoom' found in package 'mx.transitions.easing'.
var tween_handler:Object = new mx.transitions.Tween(slides_mc1.holder0, "_xscale", mx.transitions.easing.Zoom, slides_mc1.holder0._xscale, 120, 2, true);

**Warning** Scene=Scene 1, layer=Layer 18, frame=1:Line 276: There is no class or package with the name 'mx.transitions.easing.Zoom' found in package 'mx.transitions.easing'.
var tween_handler2:Object = new mx.transitions.Tween(slides_mc1.holder0, "_yscale", mx.transitions.easing.Zoom, slides_mc1.holder0._xscale, 120, 2, true);

**Warning** Scene=Scene 1, layer=Layer 18, frame=1:Line 280: There is no class or package with the name 'mx.transitions.easing.Zoom' found in package 'mx.transitions.easing'.
var tween_handler:Object = new mx.transitions.Tween(slides_mc1.holder0, "_xscale", mx.transitions.easing.Zoom, slides_mc1.holder0._xscale, 100, 2, true);

**Warning** Scene=Scene 1, layer=Layer 18, frame=1:Line 281: There is no class or package with the name 'mx.transitions.easing.Zoom' found in package 'mx.transitions.easing'.
var tween_handler2:Object = new mx.transitions.Tween(slides_mc1.holder0, "_yscale", mx.transitions.easing.Zoom, slides_mc1.holder0._xscale, 100, 2, true);

Total ActionScript Errors: 4 Reported Errors: 4
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2. как можно зумищейся мувик расширять от центра? пробывал делать центровку 1 мува (отдельного) - все получается, но т.к. у меня 4 холдера в 1 мувике, то ничерта не получается. что делать, подскажите плиз.

спасибо