Answer:
Very simple!First click on add symbol in library,then draw a cursor,make sure its clicking point is on the movie clip's center.Insert keyframe in 2.Change the cursor's color.Now to the scene.Give these actions to the cursor and press Ctrl+Enter to test.
Actions-
onClipEvent (load) {
Mouse.hide();
_x = _root._xmouse;
_y = _root._ymouse;
}
onClipEvent (mouseMove) {
_x = _root._xmouse;
_y = _root._ymouse;
}