[flexcoders] Highlight and select all rows in datagrid by button.

[ad9798]

I was able to select one row by doing 

myDataGrid.selectedIndex = 1; <== index number of the row.

However, I'm trying to create a button that select all rows in datagrid.
I have tried following but no success..

private function selectAll() : void {
   for( var i:int = 0; i < myDataProvider.length; i++ ){
      myDataGrid.selectedIndices[i] = i;
      myDataGrid.selectedItems[i] = myDataProvider[i];
   }
}

Any idea? any suggestion?