Hi,

usually when someone doesn't get any replies, especially this long, it's because either your question is too vague and hard to understand or that people are intimidated by the huge text and coding, so they're like tl;dr (too long, didn't read) and ignore the post.

Anyways, I myself am not quite sure what you're having trouble with. The text inside the Dynamic Textfield is showing, right? If not, then it might just be a case of forgotten embedded characters, meaning that you can't see anything inside your Dynamic Textfield (except for some characters, sometimes), in that case, simply click on your textfield, open Properties Panel [CTRL+F3], press Embed.../Character Embedding button, tick/check the ones you'd like (for all common characters, tick/check Uppercase, Lowercase, Numerals and Punctuation) and press OK. Does this solve your problem?

If not, then another thing to consider, is that when you give your textfield a value using text_field.text = "some text";, it's not being saved as a variable, you're only changing the value of the textfield, what's inside it, no variables are created during that process. Textfield.text is just a property all Textfields share, because it can be used to access their display value. Therefore, no variables are saved inside your movieclip.

From my understanding, you want to change the text of textfields placed on Frame 10, right? If so, then you can't do this directly unless you are on Frame 20 of that movieclip at the time of changing the textfields' value. What you can do, is to save the text you want to assign your textfield, in a variable, and when you later come to Frame 10, you can set its value to whatever the variable's value is. To do this, create a variable inside your main movieclip, btnFISB/btnTISB, using this code:

Code:
btnFISB.textVar1 = "some text";
Then that variable will be accessible within your movieclip, as long as the movieclip exists. Now, on Frame 10, or whatever frame you'll be placing descMC, type this on that Frame:

Code:
descMC.serviceMainTitle.text = textVar1;
you don't need to reference your variable with an absolute path (which in this case would be, this.textVar1), because your variable already belongs to the movieclip you're inside, so need to do so.

If this does not help you, then please be kind enough to elaborate on your matter, to give us a better insight on what you're desiring.