Flex AdvancedDatagrid data display

I  have an AdvancedDatagrid,populating data from dataprovider (ArrayCollection).

Dataprovider  has values null in case of missing column values. I dont want this null to be displayed as a column value in DataGrid. How to remove the diplay of "null" in a column.
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Use a label function on the dataGrid column.:
private function labelIsNull(item:Object, column:DataGridColumn):String {
   if(item[column.dataField] == null){
       return "";
      return item[column.dataField];

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Apache Flex

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