Resizing parent movie clip affects child movie clip

[LEFT]i am trying to use the Tween class to change the size of movie clip to certain height.
the code works for me but when resizing the parent, it effects the child.
i tried the height and scaleY property for the thum, but does not work. i hope i can fin guidance
code commented, i hope it will be clear

thanks in advance

ActionScript Code:
[LEFT][COLOR=#0000FF]import[/COLOR] fl.[COLOR=#000080]transitions[/COLOR].[COLOR=#000080]Tween[/COLOR];

[COLOR=#0000FF]import[/COLOR] fl.[COLOR=#000080]transitions[/COLOR].[COLOR=#000080]easing[/COLOR].*;
[COLOR=#0000FF]import[/COLOR] fl.[COLOR=#000080]transitions[/COLOR].[COLOR=#000080]TweenEvent[/COLOR];

[COLOR=#808080]// init[/COLOR]
[COLOR=#000000]var[/COLOR] thumbHeight:[COLOR=#0000FF]Number[/COLOR] = [COLOR=#000080]34[/COLOR].[COLOR=#000080]3[/COLOR]

[COLOR=#808080]// paths to instances[/COLOR]
[COLOR=#000000]var[/COLOR] sec1_[COLOR=#000080]1[/COLOR] = contentScroller_mc.[COLOR=#000080]content[/COLOR].[COLOR=#000080]sq1[/COLOR];
[COLOR=#000000]var[/COLOR] sec1_[COLOR=#000080]2[/COLOR] = contentScroller_mc.[COLOR=#000080]content[/COLOR].[COLOR=#000080]sq2[/COLOR];
[COLOR=#000000]var[/COLOR] sec1_[COLOR=#000080]3[/COLOR] = contentScroller_mc.[COLOR=#000080]content[/COLOR].[COLOR=#000080]sq3[/COLOR];
[COLOR=#000000]var[/COLOR] sec1_[COLOR=#000080]4[/COLOR] = contentScroller_mc.[COLOR=#000080]content[/COLOR].[COLOR=#000080]sq4[/COLOR];
[COLOR=#000000]var[/COLOR] sec1_[COLOR=#000080]5[/COLOR] = contentScroller_mc.[COLOR=#000080]content[/COLOR].[COLOR=#000080]sq5[/COLOR];
[COLOR=#000000]var[/COLOR] sec1_[COLOR=#000080]6[/COLOR] = contentScroller_mc.[COLOR=#000080]content[/COLOR].[COLOR=#000080]sq6[/COLOR];
[COLOR=#000000]var[/COLOR] sec1_[COLOR=#000080]7[/COLOR] = contentScroller_mc.[COLOR=#000080]content[/COLOR].[COLOR=#000080]sq7[/COLOR];
[COLOR=#000000]var[/COLOR] trans = contentScroller_mc.[COLOR=#000080]content[/COLOR].[COLOR=#000080]trans_mc[/COLOR]
[COLOR=#000000]var[/COLOR] maskContent = contentScroller_mc.[COLOR=#000080]masker[/COLOR];
[COLOR=#000000]var[/COLOR] scroller = contentScroller_mc.[COLOR=#000080]sb[/COLOR][COLOR=#808080]//.track;[/COLOR]
[COLOR=#000000]var[/COLOR] boarder = contentScroller_mc.[COLOR=#000080]boarder_mc[/COLOR];
[COLOR=#000000]var[/COLOR] thumb = contentScroller_mc.[COLOR=#000080]sb[/COLOR].[COLOR=#000080]thumb[/COLOR];
[COLOR=#000000]var[/COLOR] content_mc = contentScroller_mc.[COLOR=#000080]content[/COLOR];

[COLOR=#808080]// adding listener to buttons[/COLOR]
sec1_mc.[COLOR=#000080]addEventListener[/COLOR][COLOR=#000000]([/COLOR]MouseEvent.[COLOR=#000080]CLICK[/COLOR], showSec1[COLOR=#000000])[/COLOR];

[COLOR=#808080]// using Tweeen to hide the contents[/COLOR]
[COLOR=#000000]function[/COLOR] showSec1COLOR=#000000[/COLOR]:[COLOR=#0000FF]void[/COLOR] [COLOR=#000000]{[/COLOR]
[COLOR=#000000]var[/COLOR] sec:Tween = [COLOR=#000000]new[/COLOR] Tween[COLOR=#000000]([/COLOR]sec1_[COLOR=#000080]4[/COLOR], [COLOR=#FF0000]“alpha”[/COLOR], Regular.[COLOR=#000080]easeIn[/COLOR], [COLOR=#000080]1[/COLOR], [COLOR=#000080]0[/COLOR], [COLOR=#000080]0[/COLOR].[COLOR=#000080]5[/COLOR], [COLOR=#000000]true[/COLOR][COLOR=#000000])[/COLOR];
[COLOR=#000000]var[/COLOR] sec6:Tween = [COLOR=#000000]new[/COLOR] Tween[COLOR=#000000]([/COLOR]sec1_[COLOR=#000080]6[/COLOR], [COLOR=#FF0000]“alpha”[/COLOR], Regular.[COLOR=#000080]easeIn[/COLOR], [COLOR=#000080]1[/COLOR], [COLOR=#000080]0[/COLOR], [COLOR=#000080]0[/COLOR].[COLOR=#000080]5[/COLOR], [COLOR=#000000]true[/COLOR][COLOR=#000000])[/COLOR];

[COLOR=#0000FF]if[/COLOR] [COLOR=#000000]([/COLOR]content_mc != [COLOR=#000080]0[/COLOR][COLOR=#000000])[/COLOR] [COLOR=#000000]{[/COLOR]
    [COLOR=#000000]**var**[/COLOR] contentTween:Tween = [COLOR=#000000]**new**[/COLOR] Tween[COLOR=#000000]([/COLOR]content_mc, [COLOR=#FF0000]"y"[/COLOR], Regular.[COLOR=#000080]easeIn[/COLOR], content_mc.[COLOR=#000080]y[/COLOR], [COLOR=#000080]0[/COLOR], [COLOR=#000080]1[/COLOR], [COLOR=#000000]**true**[/COLOR][COLOR=#000000])[/COLOR];
[COLOR=#000000]}[/COLOR]
[COLOR=#808080]*// start motion*[/COLOR]
sec.[COLOR=#000080]addEventListener[/COLOR][COLOR=#000000]([/COLOR]TweenEvent.[COLOR=#000080]MOTION_FINISH[/COLOR], moveLegend1[COLOR=#000000])[/COLOR];

[COLOR=#000000]}[/COLOR]

[COLOR=#808080]// using Tween to position the content[/COLOR]
[COLOR=#000000]function[/COLOR] moveLegend1COLOR=#000000[/COLOR]:[COLOR=#0000FF]void[/COLOR] [COLOR=#000000]{[/COLOR]
[COLOR=#000000]var[/COLOR] sec5:Tween = [COLOR=#000000]new[/COLOR] Tween[COLOR=#000000]([/COLOR]sec1_[COLOR=#000080]5[/COLOR], [COLOR=#FF0000]“y”[/COLOR], Regular.[COLOR=#000080]easeIn[/COLOR], sec1_[COLOR=#000080]5[/COLOR].[COLOR=#000080]y[/COLOR], [COLOR=#000080]167[/COLOR].[COLOR=#000080]8[/COLOR], [COLOR=#000080]1[/COLOR], [COLOR=#000000]true[/COLOR][COLOR=#000000])[/COLOR];
[COLOR=#000000]var[/COLOR] sec7:Tween = [COLOR=#000000]new[/COLOR] Tween[COLOR=#000000]([/COLOR]sec1_[COLOR=#000080]7[/COLOR], [COLOR=#FF0000]“y”[/COLOR], Regular.[COLOR=#000080]easeIn[/COLOR], sec1_[COLOR=#000080]7[/COLOR].[COLOR=#000080]y[/COLOR], [COLOR=#000080]220[/COLOR].[COLOR=#000080]8[/COLOR], [COLOR=#000080]1[/COLOR], [COLOR=#000000]true[/COLOR][COLOR=#000000])[/COLOR];
[COLOR=#000000]var[/COLOR] transY:Tween = [COLOR=#000000]new[/COLOR] Tween[COLOR=#000000]([/COLOR]trans, [COLOR=#FF0000]“y”[/COLOR], Regular.[COLOR=#000080]easeIn[/COLOR], trans.[COLOR=#000080]y[/COLOR], [COLOR=#000080]246[/COLOR], [COLOR=#000080]1[/COLOR], [COLOR=#000000]true[/COLOR][COLOR=#000000])[/COLOR];
[COLOR=#000000]var[/COLOR] maskCont:Tween = [COLOR=#000000]new[/COLOR] Tween[COLOR=#000000]([/COLOR]maskContent, [COLOR=#FF0000]“height”[/COLOR], Regular.[COLOR=#000080]easeIn[/COLOR], maskContent.[COLOR=#0000FF]height[/COLOR], [COLOR=#000080]242[/COLOR].[COLOR=#000080]3[/COLOR], [COLOR=#000080]1[/COLOR], [COLOR=#000000]true[/COLOR][COLOR=#000000])[/COLOR];
[COLOR=#000000]var[/COLOR] tracker:Tween = [COLOR=#000000]new[/COLOR] Tween[COLOR=#000000]([/COLOR]scroller, [COLOR=#FF0000]“height”[/COLOR], Regular.[COLOR=#000080]easeIn[/COLOR], scroller.[COLOR=#0000FF]height[/COLOR], [COLOR=#000080]242[/COLOR].[COLOR=#000080]3[/COLOR], [COLOR=#000080]1[/COLOR], [COLOR=#000000]true[/COLOR][COLOR=#000000])[/COLOR];
[COLOR=#000000]var[/COLOR] scrollerY:Tween = [COLOR=#000000]new[/COLOR] Tween[COLOR=#000000]([/COLOR]boarder, [COLOR=#FF0000]“height”[/COLOR], Regular.[COLOR=#000080]easeIn[/COLOR], boarder.[COLOR=#0000FF]height[/COLOR], [COLOR=#000080]242[/COLOR].[COLOR=#000080]3[/COLOR], [COLOR=#000080]1[/COLOR], [COLOR=#000000]true[/COLOR][COLOR=#000000])[/COLOR];
[COLOR=#000000]var[/COLOR] maskContY:Tween = [COLOR=#000000]new[/COLOR] Tween[COLOR=#000000]([/COLOR]maskContent, [COLOR=#FF0000]“y”[/COLOR], Regular.[COLOR=#000080]easeIn[/COLOR], maskContent.[COLOR=#000080]y[/COLOR], [COLOR=#000080]0[/COLOR], [COLOR=#000080]1[/COLOR], [COLOR=#000000]true[/COLOR][COLOR=#000000])[/COLOR];
[COLOR=#000000]var[/COLOR] scrollerY_Height:Tween = [COLOR=#000000]new[/COLOR] Tween[COLOR=#000000]([/COLOR]scroller, [COLOR=#FF0000]“y”[/COLOR], Regular.[COLOR=#000080]easeIn[/COLOR], scroller.[COLOR=#000080]y[/COLOR], [COLOR=#000080]0[/COLOR], [COLOR=#000080]1[/COLOR], [COLOR=#000000]true[/COLOR][COLOR=#000000])[/COLOR];
[COLOR=#000000]var[/COLOR] boarderY:Tween = [COLOR=#000000]new[/COLOR] Tween[COLOR=#000000]([/COLOR]boarder, [COLOR=#FF0000]“y”[/COLOR], Regular.[COLOR=#000080]easeIn[/COLOR], boarder.[COLOR=#000080]y[/COLOR], [COLOR=#000080]0[/COLOR], [COLOR=#000080]1[/COLOR], [COLOR=#000000]true[/COLOR][COLOR=#000000])[/COLOR];
[COLOR=#000000]var[/COLOR] sec6_X:Tween = [COLOR=#000000]new[/COLOR] Tween[COLOR=#000000]([/COLOR]sec1_[COLOR=#000080]6[/COLOR], [COLOR=#FF0000]“x”[/COLOR], Regular.[COLOR=#000080]easeIn[/COLOR], sec1_[COLOR=#000080]6[/COLOR].[COLOR=#000080]x[/COLOR], -[COLOR=#000080]180[/COLOR], [COLOR=#000080]0[/COLOR].[COLOR=#000080]5[/COLOR], [COLOR=#000000]true[/COLOR][COLOR=#000000])[/COLOR];
[COLOR=#000000]var[/COLOR] sec6_Y:Tween = [COLOR=#000000]new[/COLOR] Tween[COLOR=#000000]([/COLOR]sec1_[COLOR=#000080]6[/COLOR], [COLOR=#FF0000]“y”[/COLOR], Regular.[COLOR=#000080]easeIn[/COLOR], sec1_[COLOR=#000080]6[/COLOR].[COLOR=#000080]y[/COLOR], [COLOR=#000080]74[/COLOR], [COLOR=#000080]0[/COLOR].[COLOR=#000080]5[/COLOR], [COLOR=#000000]true[/COLOR][COLOR=#000000])[/COLOR];
[COLOR=#000000]var[/COLOR] sec4_X:Tween = [COLOR=#000000]new[/COLOR] Tween[COLOR=#000000]([/COLOR]sec1_[COLOR=#000080]4[/COLOR], [COLOR=#FF0000]“x”[/COLOR], Regular.[COLOR=#000080]easeIn[/COLOR], sec1_[COLOR=#000080]4[/COLOR].[COLOR=#000080]x[/COLOR], -[COLOR=#000080]180[/COLOR], [COLOR=#000080]0[/COLOR].[COLOR=#000080]5[/COLOR], [COLOR=#000000]true[/COLOR][COLOR=#000000])[/COLOR];
[COLOR=#000000]var[/COLOR] sec4_Y:Tween = [COLOR=#000000]new[/COLOR] Tween[COLOR=#000000]([/COLOR]sec1_[COLOR=#000080]4[/COLOR], [COLOR=#FF0000]“y”[/COLOR], Regular.[COLOR=#000080]easeIn[/COLOR], sec1_[COLOR=#000080]4[/COLOR].[COLOR=#000080]y[/COLOR], [COLOR=#000080]74[/COLOR], [COLOR=#000080]0[/COLOR].[COLOR=#000080]5[/COLOR], [COLOR=#000000]true[/COLOR][COLOR=#000000])[/COLOR];

[COLOR=#0000FF]if[/COLOR] [COLOR=#000000]([/COLOR]thumb.[COLOR=#000080]y[/COLOR] != [COLOR=#000080]0[/COLOR][COLOR=#000000])[/COLOR] [COLOR=#000000]{[/COLOR]
    [COLOR=#000000]**var**[/COLOR] thumbTween:Tween = [COLOR=#000000]**new**[/COLOR] Tween[COLOR=#000000]([/COLOR]thumb, [COLOR=#FF0000]"y"[/COLOR], Regular.[COLOR=#000080]easeIn[/COLOR], thumb.[COLOR=#000080]y[/COLOR], [COLOR=#000080]0[/COLOR], [COLOR=#000080]1[/COLOR], [COLOR=#000000]**true**[/COLOR][COLOR=#000000])[/COLOR];
[COLOR=#000000]}[/COLOR]

[COLOR=#808080]*// this if is for checking the height of the scroller and set the thum to its original height*[/COLOR]
[COLOR=#808080]*// the finish is for test, but that number does not effect the thumb movie clip*[/COLOR]
[COLOR=#0000FF]if[/COLOR][COLOR=#000000]([/COLOR]scroller.[COLOR=#0000FF]height[/COLOR] == [COLOR=#000080]242[/COLOR].[COLOR=#000080]3[/COLOR][COLOR=#000000])[/COLOR][COLOR=#000000]{[/COLOR]
    [COLOR=#000000]**var**[/COLOR] thumbScale:Tween = [COLOR=#000000]**new**[/COLOR] Tween[COLOR=#000000]([/COLOR]thumb, [COLOR=#FF0000]"height"[/COLOR], Regular.[COLOR=#000080]easeIn[/COLOR], thumb.[COLOR=#0000FF]height[/COLOR], [COLOR=#000080]10[/COLOR], [COLOR=#000080]0[/COLOR].[COLOR=#000080]1[/COLOR], [COLOR=#000000]**true**[/COLOR][COLOR=#000000])[/COLOR]
[COLOR=#000000]}[/COLOR]

[COLOR=#000000]}[/COLOR]
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