Vertical Scrollbar in Datagrid

Question

Hello,

 

I am having datagrid, I need to show vertical scrollbar in it, I have used following still not showing

 

<DataGrid x:Name="VoterMaster_grid" ItemsSource="{Binding Tables}" CanUserResizeRows="False" CanUserAddRows="False" AutoGenerateColumns="False" IsReadOnly="True"

ScrollViewer.CanContentScroll="False" VerticalScrollBarVisibility="Auto" MouseDoubleClick="VoterMaster_grid_MouseDoubleClick_1"  >