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
    Flow.Add(() => Message.ShowError("Hello")
         , FlowMode.ExpandBefore);

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