ActivityElement position problems

[Henrik]

The ActivityElement positions itself slightly off to the right and when used in a SplitView it sometimes calculates the center incorrectly.

The following replacement for the ActivityElement class solves these issues. It Makes the ActivityElement inherit from Element instead of UIViewElement

public class ActivityElement : Element {
    public ActivityElement():base(""){

    }

    UIActivityIndicatorView indicator;

    public bool Animating {
        get {
            return indicator.IsAnimating;
        }
        set {
            if (value)
                indicator.StartAnimating ();
            else
                indicator.StopAnimating ();
        }
    }

    static NSString ikey = new NSString ("ActivityElement");

    protected override NSString CellKey {
        get {
            return ikey;
        }
    }

    public override UITableViewCell GetCell (UITableView tv)
    {
        var cell = tv.DequeueReusableCell (CellKey);
        if (cell == null){
            cell = new UITableViewCell (UITableViewCellStyle.Default, CellKey);
        }

        indicator = new UIActivityIndicatorView (UIActivityIndicatorViewStyle.Gray);
        var sbounds = tv.Frame;
        var vbounds = indicator.Bounds;

        indicator.Frame = new RectangleF((sbounds.Width-vbounds.Width)/2, 12, vbounds.Width, vbounds.Height);
        indicator.StartAnimating ();

        cell.Add (indicator);

        return cell;
    }

    protected override void Dispose (bool disposing)
    {
        if (disposing){
            if (indicator != null){
                indicator.Dispose ();
                indicator = null;
            }
        }
        base.Dispose (disposing);
    }
}