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Flex - how do I sort the datagrid column that uses the item renderer in the header?

I am using an advanced data grid that uses specialized item rendering for the column header and now sorting is not working. If I output a custom renderer it works fine, but I need it to work with the renderer. Does anyone know how to do this? I am new to Flex and ActionScript.

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You need to implement sortCompareFunction for the DataGrid column:

For example:

<mx:DataGridColumn headerText="Foo" dataField="bar" sortCompareFunction="compareTypes">


Lets just pretend this DataGridColumn is an inline item renderer ...

And then the function is defined like this:

public static function compareTypes(typeOne:Object, typeTwo:Object):int
{
    return ObjectUtil.stringCompare(String(typeOne.foo), String(typeTwo.foo));
}
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