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After setting up the tables and queries that you will use, you need to configure one of the tables as the DataSource in the DataGridWindow component configuration (1 in image below).

To manipulate a DataGrid control in CodeBehind, th   e the best approach is to use the Control Name field (2 in image below), for the configuration dialog.

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Then, you can use that given name to get control of the element and change its properties. 

TDataGridWindow grid = CurrentDisplay.GetDataGrid("Employees"); 
grid.GridControl.SetColumnSparkline("Orders", this.SparklineCollectionDelegate, style);
// SetColumnSparkline parameters - fieldName (string)
//	               - populateCallback (SparklineCollectionDelegate)
//	               - style (string)

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A delegate is an object which refers to a method or you can say consider it is as a reference type variable that can hold holds a reference to the methodsa method. It provides a way which tells to know which method is to be called when an event is triggered. 

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