XAF : Change Listview Default GroupSummary

The following steps will used to change group summary for Listview:

1. Open model designer by click on application file Model.xafml under YourProject.Web
    
2. Change GroupSummary Property as shown below:
   
    
3. GroupSummary Format Structure {1}:{2},{3}:{4}
   example : TotalPrivateCharge:Sum,TotalPrivateCharge:Sum={0:n2}
    
1. Property Name
2. Aggregation Function
3. Property Name
4. Aggregation String Format. [Sum={0:n2}]
1. '0' means first argument which is TotalPrivateCharge
2. 'n2' means the second argument which is aggregation function value.
5. Result for this aggregation function is 'Sum=25.12'