.Net(beer) 0 Newbie Poster

Good day,
I have created a WPF (visual basic) application. On the main-page, I have "tab control" inside a "grid".
On "tab one" the user selects an "ID" and below the "datagrid control" populates with information (this works).
On "tab two" more data (from a different table (linked – using the designer)) should populate as well (this does not work). Both data-sets should change (Tab one and Tab two) as the ID is changed.
I followed the MS instructions at: https://msdn.microsoft.com/en-us/library/dd264862.aspx
Help PLEASE!!!!!!
PS. – I a beginner VB .Net