More Scrolling Function in Flash 5 - Page 8

Here are the Object Actions attached to our instance of invisibut on the button layer inside the scroll_shape MC:

First of all, "this" is Flash's way of using a relative target path instead of an absolute path (which would employ the syntax "_root.scroll_shape.startDrag"). The first action after the "on (press)" handler is telling Flash to start dragging the entire MC that houses the button. So, when invisibut is pressed in the exported SWF movie, it starts dragging everything in all three layers of the scroll_shape MC; invisibut, the scroll_shape graphic (on the grphc layer), and the logic MC. However we only see the graphic move since the other 2 instances are "invisible." The parameters in parenthesis after "this.startDrag" set the upper and lower limits that the scroll_shape are constrained by, and also constrain the drag so that the shape cannot be moved horizontally (along the _x axis).