■ ボタンロールオーバー時に処理を実行するには

//メインタイムラインのフレームアクション
this._btn.onRollOver = function(){
_txt.text = "onRollOver";
};
this._btn.onRollOut = function(){
_txt.text = "onRollOut";
};
this._btn.onDragOver = function(){
_txt.text = "onDragOver";
};
this._btn.onDragOut = function(){
_txt.text = "onDragOut";
};

//ボタンアクション
on (rollOver) {
this._txt.text = "rollOver";
}
on (rollOut) {
this._txt.text = "rollOut";
}
on (dragOver) {
this._txt.text = "dragOver";
}
on (dragOut) {
this._txt.text = "dragOut";
}