/// <summary>
/// Adds a button to the set of registered buttons
/// </summary>
/// <param name="b">The button to add</param>
public void AddButton(AbstractElement b)
{
Buttons.Add(b);
}
/// <summary>
/// Adds a button to the set of registered buttons
/// </summary>
/// <param name="b">The button to add</param>
public void RemoveButton(AbstractElement b)
{
if (Buttons.Contains(b))
Buttons.Remove(b);
}