Remove child within a movieclip

Hi guys,
Does anyone know the actionscript 3.0 parameters in removing the child within a movieclip?
This is my scenario:
1. I have two (2) languages which play on the main timeline. Each languages are movieclips.
2. I have a movieclip which has buttons. These buttons are added dynamically using "stage.addChild(main_menu)"
3. I have a go back button together with the main timeline.
How can remove a child on a timeline?
For example when I choose the language A: it will play through by a movieclip and the buttons will be added dynamically [the dynamically added buttons are inside this movieclip; also the AS3 is inside that movieclip]. I wanted to remove the added child when the go back button is pressed and return to certain frame on the main timeline. The go back button is not included in the said movieclip--it is within the same timeline of languages and I wanted the script to be on the main timeline.
Hope someone could help me. Thanks a lot.
YSONG

http://mtrinitaria.com/mykhel/as3-tips-of-the-day-removechild/
http://mtrinitaria.com/mykhel/as3-tip-of-the-day-removechild-problems-and-solutions/
http://livedocs.adobe.com/flash/9.0/ActionScriptLangRefV3/flash/display/DisplayObjectConta iner.html

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How do I remove a child from the root timeline from within a separate movieclip?
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I could write a function in the root timeline that just removes child and then run that from within the movieclip but is there a better way?
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Thanks for replying.
I asked on Kirupa but I couldn't access the site so I asked here.
I guy answered with this
MovieClip(parent).removeChild(MovieClip(parent).getChildByName("mc1"));
It works fine, is this the best way to do it?
Not sure if I understand what you meant?
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Sorry to bring problems but i am trying to learn some as3 and so far i can not resolve this situation ,,,,,,
this is the script i am using ,,,,,,,,,,,,,,
Ent.buttonMode = true;
Bio.buttonMode = true;
ent.addEventListener(MouseEvent.CLICK, goEnt);
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var new Ent:MovieClip = new firstIntro();
this.addChild(newEnt);
newEnt.x = 659;
newEnt.y = 428;
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the problem is that when i click on first button the Movie Clip does load ok but when i click on second button the first movie cliip is visible ,,,, i have try everything i have read here but no luck ,,,,,,, i want to learn how to remove first child and allow only the second child to show up ,,,,,,, i am looking forward to add more buttons so the remove child should be for multiple buttons ,,,,, i am learning and so far did purchase a online tutorial but did not help me with this situation ,,,, thank you all in advance ,,,,,

Create a variable to hold a reference to any child object that is added to the display list, then when any given button is used to add a new movieclip to the display list, use removeChild to get rid if any existing movie clip that was added through the reference in the variable. After the new movie clip is added to the display list, add a reference to that movie clip to the variable so that it can be used when the next movie clip will be added.
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