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                        Is there a quick way to SumFunction?
e.g. I can use SumCount like so:
    
But, for a SumFunction, it seems to crash unless I explicitly define the Sourcefield like so
    
Is there a way to make the SumFunction, automatically use the source from the parent column?
                                e.g. I can use SumCount like so:
| <telerikGridView:GridViewDataColumn Header="Qty" Width="40" DataMemberBinding="{Binding quantity}"> | 
| <telerikGridView:GridViewDataColumn.AggregateFunctions> | 
| <telerikData:CountFunction Caption="Count: " /> | 
| </telerikGridView:GridViewDataColumn.AggregateFunctions> | 
| </telerikGridView:GridViewDataColumn> | 
But, for a SumFunction, it seems to crash unless I explicitly define the Sourcefield like so
| <telerikGridView:GridViewDataColumn Header="Amount" Width="75" DataMemberBinding="{Binding totalinc}" | 
| DataFormatString="{}{0:c}"> | 
| <telerikGridView:GridViewDataColumn.AggregateFunctions> | 
| <telerikData:SumFunction SourceField="totalinc" /> | 
| </telerikGridView:GridViewDataColumn.AggregateFunctions> | 
| </telerikGridView:GridViewDataColumn> | 
Is there a way to make the SumFunction, automatically use the source from the parent column?
