Vertical scrollbar in Datagrid

Question

Hello,

 

I am having Datagrid, I need to show vertical scroll bar in it. I tried following but not working.

 

<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"   >