title: Create Master/Detail with Combobox and DataGridView
body: <p>I have a ComboBox with its elements loaded from a sqlserver table (groups).
  I also have a DataGridView, linked to another table (users).  </p>
  
  <p>When I load the form, the combo is filled with groups, and the datagridview is filled with users (all the users)</p>
  
  <p><strong>1)</strong> I want to be able to select a group from the ComboBox (dropDownList), and then to refresh the DataGridView with the users that belong to that selected group...</p>
  
  <p><strong>2)</strong> And How can I show a join relation in the DataGridView? Let's say I want to show the groupName in the last column of the each user...</p>
  
  <p><strong>PS:</strong> </p>
  
  <blockquote>
    <p>I have an xsd Dataset created in my VS2008 project with its
    corresponding tableAdapters generated
    (groupTableAdapter, userTableAdapter)
    and some sql-methods added to each
    adapter</p>
  </blockquote>