Flash UI tooltips

Sometimes when programming flash gives tooltips for methods / data members of variabels after pushing the “.” [ p.s. what is a better term ]. Other times it does not.

this.createTextField("mouse_info", 999, 5, 5, 250, 80);
mouse_info.html = true;
mouse_info.wordWrap = true;

The properties of mouse_info come up blue, but when i type “mouseinfo.” I do not get tooltips.

Do I need to do some special casting to accomplish this?

thanks ya’ll