private void UpdateIndicators ()
{
if (Indicator != null) {
Indicator.RemoveFromSuperview ();
}
this.Indicator = null;
if (Mode == MBProgressHUDMode.Determinate) {
Indicator = new MBRoundProgressView ();
} else {
Indicator = new UIActivityIndicatorView (UIActivityIndicatorViewStyle.WhiteLarge);
((UIActivityIndicatorView)Indicator).StartAnimating ();
}
this.AddSubview (Indicator);
}