/// <summary>
///
/// </summary>
/// <param name="item"></param>
protected override void BeforeItemAdd(Component item)
{
base.BeforeItemAdd(item);
if (!(item is BoxComponentBase))
{
throw new InvalidOperationException(string.Format("Invalid type of Control ({0}). Only Components which inherit from Ext.Net.BoxComponent can be added to this ({1}) Items Collection.", item.GetType(), this.GetType()));
}
}
