Text not Displaying on TextInput component in MovieClip

Dear Friends.
Please tell me how to set a text in a TextInput which is placed inside Movieclip. when ever i set a text its not display on it.

I have a MoveClip which contain a TextInput Component. this TextInput have name “letter”. when the Application runs it dynamical add the MovieClip like

[AS2] Code

this.timeline.attachMovie(“Key_MC2”,“key”+1,1);

after adding the movieClip i tried to set a Text

[AS2] Code

this.timeline[“key”+1].letter.text = “Some Text”;

So nothing is displayed on TextInput.
Please help me.