Dynamic Text in a movie clip?

I am unable to get a simple dynamic text box to work properly when it is in a movie clip. I am sure my AS is ok as I can get it to work when it is placed in the main scene. I am trying to place the text in a window that is brought up through navigation. When I place it there, I cant get it to work. Is this a limitation of dynamic text that it needs to be in the main scene?

Try this. The history link works.

Thanks alot. I really appreciate your help. I think I found another way to do it too this morning.

loadText = new loadVars();
//creating the loadVarsText function
loadText.onLoad = function() {
textbox.text = this.historyText;