/// <summary>
/// Adds a <see cref="ItemWidget"/> to the container.
/// </summary>
/// <param name="sender">
/// A <see cref="System.Object"/>
/// </param>
/// <param name="args">
/// A <see cref="EventArgs"/>
/// </param>
private void OnAddTokenItmActivate(object sender, EventArgs args)
{
container.AddItem(new ExpressionTokenWidget(container));
}
