WPF Datagrid cannot refresh timely

I have a WPF datagird which is bound to a datatable. After I changed the value of certain cell, like the first row, column qty from 1 to 2. The same row will not update if I just click other cell in the same row. It will update if I press enter or click other row. But actually the datatable has been update as soon as I exit editing more as you can see the total in the status bar has been changed already. What shall I to to keep the same row updated if I just click other cell in the same row without pressing enter?

Attachment 149575

Can you show the XAML you use for the datagrid, including the bindings you use?

Thanks, I solved it.