Java :: Access Movie In External Swf Using Xml Data?

Is it possible to access a movieclip inside an external swf (.fla file), using data from a vector?

The following code works correctly:

this._graphics.message2_mc.textLabel_txt.text = "Test";

Where as when I loop through a vector and try to replace "message2_mc" it cannot find the movie clip:

for(var i:uint = 1; i <= this._playlistState.subMovieVector.length - 1; i++)
{
var movieName:String = this._playlistState.subMovieVector[i].movieName;
this._graphics.movieName.textLabel_txt.text = "Test";
}

Presumably this is because I am putting a string in the middle of the line of code accessing the movie clip?