How do I set _bounds so that my Rectangle drags correctly?

Question

Hi,
So I'm having this issue. I have a movieclip that's longer than the width of the stage. I've put a mask over the stage so that whatever's outside the stage won't be seen. I want the user to be able to drag the movie clip left and right to get to the buttons. However, right now if I have the movieclip where it's left edge is at the left edge of the stage, it will drag off and you can see all this empty stage. If I move the movieclip in the center and try it, you can only see the part of the movieclip that the mask allows, therefore making the dragging useless because it doesn't reveal the rest of the movieclip.
Should I take off the mask and is there some way to set the _bounds so that way I can place the movieclip in, and if can be dragged left and right without it revealing empty stage?
Here's what I have:
import flash.geom.Rectangle;
var rx:Number = 0;
var ry:Number = 0;
var rwidth:Number = 550;
var rheight:Number = 400;
var _bounds:Rectangle = new Rectangle(rx, ry, rwidth, rheight);
campusMC.addEventListener(MouseEvent.MOUSE_DOWN, mouseDown);
stage.addEventListener(MouseEvent.MOUSE_UP, mouseReleased);
function mouseDown(event:MouseEvent):void {
    startDrag(false, _bounds);
    /*rectangle*/
function mouseReleased(event:MouseEvent):void {
    stopDrag();

Answer 1

Hey hi,
While using the start drag we can give some limitations limitations.
object.startDrag(false, object.width / 2, object.height / 2, stage.stageWidth - object.width / 2, stage.stageHeight - object.height / 2);
try this.