Defining the Expand event outside of the controller

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There is another way to set a selection list controller - either in a column of an entity or in a type. This is achieved by registering to the Exand event of that type / column.
For example, the CustomerID type code looks like this:

using Firefly.Box;
using ENV.Data;
namespace Northwind.Types
{
    /// <summary>Customer ID(T#1)</summary>
    public class CustomerID : TextColumn 
    {
        public CustomerID() : base("Customer ID", "5")
        {
             Expand += () => Create<Customers.IShowCustomers>().Run(this);
        }
    }
} 

This way, whenever this type is used in a UIController, the Expand (Zoom) will be available to the user.

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