About flex Sprite

The sprite class is a basic display list constructor. It is a display list node that Displays graphs and contains subitems.
A sprite object is similar to a video clip but has no timeline. Sprite is the base class of objects that do not require timeline. For example, Sprite is the logical base class of the user interface (UI) component that generally does not use the timeline.

Therefore, when we dynamically load components (such as simplebutton, textfield, and loader), we must first inherit the sprite class (public class simplebuttonexample extends sprite ). This. addchild (XXX) cannot be used during display, so Sprite is the base class of application. If this is the case, argumenterror: Error #2025: The displayobject provided must be a sub-level error of the caller. Instead, use this. Stage. addchild (XXXX ).