A button in ContentView crashes while MonoTouch is running. Error in Monotouch 4.0?

My application worked fine in MT 3.0. Now that I have updated. I see errors when the button is in the ContentView. Failure occurs when a button is pressed. The code:

public override UITableViewCell GetCell(UITableView tableView, NSIndexPath indexPa
    float width = tableView.Bounds.Width - 70;

    var cell = tableView.DequeueReusableCell(kCellIdentifier);
    //if (cell == null)
    //{
    cell = new UITableViewCell(UITableViewCellStyle.Subtitle, kCellIdentifier);
    // }

    var behavior = tvc.behaviors.ElementAt(indexPath.Row);
    cell.TextLabel.Text = behavior.Name;
    cell.TextLabel.Font = UIFont.BoldSystemFontOfSize(22f);
    cell.DetailTextLabel.Text = behavior.Definition;
    var view = UIButton.FromType(UIButtonType.Custom);
    view.Tag = indexPath.Row;
    view.SetImage(UIImage.FromBundle("Images/plus.png"), UIControlState.Normal);
    view.Frame = new RectangleF(width - 50, 10, 50, 50);

    view.TouchUpInside += IncrementBehavior;

    var label = new UILabel(new RectangleF(width - 80, 10, 50, 50));
    label.Text = behavior.CurrentCount.ToString();
    label.BackgroundColor = UIColor.Clear;
    label.Font = UIFont.BoldSystemFontOfSize(24f);
    cell.ContentView.AddSubview(view);
    cell.ContentView.AddSubview(label);
    //cell.BackgroundColor = UIColor.Clear;)

    return cell;
}

void IncrementBehavior(object sender, EventArgs e) {
    var button = (UIButton)sender;
    var tag = button.Tag;
    var behavior = tvc.behaviors[tag];

    var indexpath = NSIndexPath.FromRowSection(tag, 0);
    var newBehavior = Repository.GetBehavior(behavior.Id);
    newBehavior.CurrentCount++;
    Repository.Update(newBehavior);
    tvc.behaviors[tag] = newBehavior;


    tvc.TableView.ReloadRows(new[] { indexpath }, UITableViewRowAnimation.None);

}

I get these errors interchangeably:

Name: NSInvalidArgumentException Reason: -[__NSCFSet BridgeSelector]: unrecognized selector sent to instance 0x5c3c570

and

No constructor found for MonoTouch.UIKit.UIControlEventProxy::.ctor(System.IntPtr)