Arrow Move

see here is my code, but my arrow display like this, i want to display like 3D arrow.

So what can i do for this?

var intervalIDLine:Number;
right_btn.onPress = function() {
    if (arrow_mc._rotation<0) {
        arrow_mc._rotation = arrow_mc._rotation+5;
    }
    intervalIDLine = setInterval(setAngleRight, 200);
};
right_btn.onRelease = function() {
    clearInterval(intervalIDLine);
};
function setAngleRight() {
    if (arrow_mc._rotation<0) {
        arrow_mc._rotation = arrow_mc._rotation+5;
    }
}
var intervalLeftID:Number;
left_btn.onPress = function() {
    if (arrow_mc._rotation>=-172.094131469727) {
        arrow_mc._rotation = arrow_mc._rotation-5;
    }
    intervalLeftID = setInterval(setAngleLeft, 200);
};
left_btn.onRelease = function() {
    clearInterval(intervalLeftID);
};
function setAngleLeft() {
    if (arrow_mc._rotation>=-172.094131469727) {
        arrow_mc._rotation = arrow_mc._rotation-5;
    }
}