ExpandBefore and ExpandAfter

"ExpandBefore" and ExpandAfter" are widely used in code that was migrated from Older version of magic, 9, 8 etc.... It's common usages are:

• Next to a code columns (for example customer Id) - to allow the user to select a customer.
• Next to a column that is bound to a button on the screen. That button than raises the Expand event which in turn will code the code next to it in the flow using ExpandAfter or ExpandBefore
• Next to columns that are bound to TabControls. When ever a tab changes - it automatically fires the expand event which then runs the code in the flow with ExpandBefore and ExpandAfter

    Columns.Add(Orders.OrderID);
    Columns.Add(Orders.CustomerID);
    Flow.Add(() => Message.ShowError("Hello")
         , FlowMode.ExpandBefore);
    Columns.Add(Orders.EmployeeID);
    Columns.Add(Orders.OrderDate);
    Columns.Add(Orders.RequiredDate); 

• Exercise ExpandBefore and ExpandAfter

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