DataGrid have an extra space for scroller
If DataGrid have scroller then that scroller should be placed after lastColumn of DataGrid not with lastColumn like in flex. there should be extra space specified for scroller
In Flex :

In Royale :

Is that for MX or Spark grid in Flex? I remember the Spark one not having that, but maybe I remember wrong.
mx:DataGrid
@pashminakazi , can u please create a short test case?
If DataGrid has scrollbar then it should be placed at separate column not with the last column,there should be one more column after last column where scrollbar should be placed if grid has scrollbar.
Royale :
Flex :

Example :
DataGridIssue.zip
Flex :
Royale : 