ActionScript 2.0 :: Dynamic Text In Button Nested In MovieClip

I've made a flash movie which will load four movie clips at runtime. Actually, the number of movie clips will depend upon number of "NODE" in XML file. Keeping XML file thing aside, I've tried hardcoded values; 4. Let me describe you the structure very well: There is a main empty movie clip, instance name "mc_scroll" which will be only item on stage. In this movie clip, another movie clip whose identifier name is "blueMovie" will be loaded dynamically. Inside this "blueMovie" MC, there is a button instance name is "blueButton" and inside this button there is a "Dynamic Text" field instance name is "btn_text".

mc_scroll->blueMovie->blueButton->btn_text

Now, I can load 4 or any number of "blueMovie" inside "mc_scroll". But I also want to set the button text for each button inside each MC!! But its not working. Below is the code:

Code:
//INSIDE THE MAIN TIME LINE
for(i=0; i<4; i++) {
txt="blue"+i;
mc_scroll.attachMovie("blueMovie", txt, mc_scroll.getNextHighestDepth(), {_y:50*i+5, _x:5});
mc_scroll.txt.blueButton.btn_text.text = txt;
[Code] .....

How to assign the text dynamically which is inside a button and this button inside a MC which is created dynamically inside a main MC! I've attached the FLA also.