Scrollpane text mc - actionscript

1

I’m having trouble scrolling. When I scroll my mc it the text turn invisible 1/2 way down.
The mc is 2783 pixels in height. I do not see why it should be limited if code is set to 100.

Can anyone please help me?

// Yes, this is a constant loop...
onClipEvent (enterFrame) {

// What's the maximum scroll value based on the content height?
scrollMax = int(this._parent.content._height - this._parent.maskclip._height);

// This is the draggable button used to scroll the content clip.
// Here we set it's height based on the height of the content.
this._parent.scrollDragButton._yscale = int((this._parent.scrollTrack._height / this._parent.content._height) * 100);

// Grab the current position of the draggable button.
position = this._parent.scrollDragButton._y;

// Set the scroll percentage value based on the current position
// of the draggable button and the height of the track and button.
percentage = ((position-this._parent.scrollTrack._Y) / (this._parent.scrollTrack._height - this._parent.scrollDragButton._height)) * 50;

// Set the percentage for the content clip to be moved to.
movePercentage = -(int((percentage * this.scrollMax) / 100));

// Move the content clip.
this._parent.content._y = int(movePercentage);

// Just for effect... Can be removed without issue.
this._parent.scrollTrackButtons._alpha = percentage;

// Check to see if the scroller is needed...
if(this._parent.maskClip._height > this._parent.content._height){
	this._parent.hideScroller();
}else{
	this._parent.showScroller();
}

}