void CreateDropdownLayer()
{
dropdownLayer = CALayer.Create();
dropdownLayer.Bounds = new RectangleF(0, 0, Width, items.Count * Font.LineSize);
dropdownLayer.Delegate = new ComboBoxElementDropdownLayerDelegate(this);
dropdownLayer.BackgroundColor = new CGColor(0, 0, 0, 1);
dropdownLayer.BorderWidth = 1;
dropdownLayer.BorderColor = new CGColor(1, 1, 0, 1);
dropdownLayer.SetNeedsDisplay();
ParentScreen.AddSublayer(dropdownLayer);
}
