flex3 - Sorting problem after grouping -

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Here's my advance data grid without grouping,

Once I apply the closing, Looking down, looking down,

Here is a piece of code that is applied after grouping and the grouping selection is assigned to the grid. 

  validateNow (); Var s: Sort = New Sort (); S.fields = [New Order Field ("Danger")]; S.comparefunction = DangerArt Item; DataGrid.dataProvider.sort =; DataGrid.dataProvider.refresh ();

Here is my comparison function, 

  Personal Function Dangers (A: Object, B: object, field: array = null): int {return ObjectUtil .stringCompare (a.hazardnum.toString (), b.hazardnum.toString (), false); }


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