Button command binding inside datagrid using elementname works but client machine does not? And Memory leak...

Inside of a DataGridTemplateColumn inside of a DataGrid

<Button Command="{Binding Path=DataContext.RunCommand, RelativeSource={RelativeSource AncestorType={x:Type DataGrid}}}"/>

works on Dev machine with 0 memory leak. Works on Client Tablet with memory leak.

<Button Command="{Binding Path=DataContext.RunCommand, ElementName=DG}"/>

Works on Dev machine but not on client.

Both have .net 4.0 Full installed. I don't understand why the client is giving different behavior as well as a memory leak.

I can remove the command and i do not have an issue... except the fact that the command doesnt work.