How to sort alphanumeric values in datagrid numerically

Hi all,
I have a datagrid column which contains AlphaNumeric values.Is there a way i can sort these values in a numerical order
eg:
having d1,d11,12,13,d2,d3,d4
d2 should come after d1..
order should be d1,d2,d3,d4,d11,d12,d13
Please help me out..if any have any idea..giving below thw code which is sorting as string
protected function ColumnSortCompare( obj1:Object, obj2:Object ):int
        if ( !obj1 && !obj2 )
            return 0;
        if ( !obj1 )
            return 1;
        if ( !obj2 )
            return -1;
        var obj1Data:String = ComplexColumnData( obj1 ).toString();
        var obj2Data:String = ComplexColumnData( obj2 ).toString();
        if ( obj1Data < obj2Data )
            return -1;
        if ( obj1Data > obj2Data )
            return 1;
        return 0;
Thanx in advance
Rajesh

Hi,
Thanks for the reply. Please dont mind if the question is simple,as I am new to flex.
While I am using
return ObjectUtil.stringCompare(obj1[fieldName], obj2[fieldName]);
it is throwing error as, undefined property fieldName.
I am calling as this
<mx:DataGridColumn headerText=""
                           editable="false"
                           sortCompareFunction="ColumnSortCompare"
                           textAlign="left"
                           dataField="{PORT_NAME}"
                           width="150"/>
How I can resolve this.Please guide me.
Thanks,
Raj

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