[AS]Button script in tween motion!

programming flash
1

Hi guys,

I have a small problem, i want to use the tween transition class in a project of my(i want to keep as low size as i can the .swf). I have applied the tween transition class to some mc that are button, but after the transition is complete the actionscript for the btns is not working. The code that i used is like this:
First keyframe:
ActionScript Code:
[FONT=Courier New][LEFT][COLOR=#0000FF]import[/COLOR] mx.[COLOR=#000080]transitions[/COLOR].[COLOR=#000080]Tween[/COLOR];
[COLOR=#0000FF]import[/COLOR] mx.[COLOR=#000080]transitions[/COLOR].[COLOR=#000080]easing[/COLOR].*;
[COLOR=#000000]var[/COLOR] tween_btn_x:Tween = [COLOR=#000000]new[/COLOR] TweenCOLOR=#000000[/COLOR];
[COLOR=#000000]var[/COLOR] tween_btn_y:Tween = [COLOR=#000000]new[/COLOR] TweenCOLOR=#000000[/COLOR];
[/LEFT]
[/FONT]

And in the keyframe 11, i have this code:
ActionScript Code:
[FONT=Courier New][LEFT][COLOR=#0000FF]stop[/COLOR]COLOR=#000000[/COLOR];
btn1.[COLOR=#0000FF]onRelease[/COLOR] = [COLOR=#000000]function[/COLOR] COLOR=#000000[/COLOR] [COLOR=#000000]{[/COLOR]
[COLOR=#0000FF]gotoAndPlay[/COLOR]COLOR=#000000[/COLOR];
[COLOR=#000000]}[/COLOR]
[/LEFT]
[/FONT]

In frame 12 the mc with the instance name “btn1” has a motion tween(frame motion tween) until frame 22 where i have a
ActionScript Code:
[FONT=Courier New][LEFT][COLOR=#0000FF]stop[/COLOR]COLOR=#000000[/COLOR];
[/LEFT]
[/FONT]

So when I enter in the frame 11 the movie stops and if i release the btn, the movie plays but the btn is not moving!

Can somebody help me with this?

Thanks in advanced, btibia.