public override void OnLayout(IGUIContext ctx, RectangleF bounds)
{
base.OnLayout(ctx, bounds);
float preferredHeight = ContentPanel.PreferredSize(ctx, bounds.Size).Height;
preferredHeight = Math.Min(preferredHeight, bounds.Height);
float marginHeight = ((bounds.Height - preferredHeight) / 2);
ContentPanel.Margin = new Padding(0, marginHeight, 0, marginHeight);
ContentPanel.Padding = new Padding(16);
}