WPF binding multiple controls to different datacontexts

I would maybe think about wrapping your user object in a seperate class then setting the DataContext properties of sub-panels that contain the data.

For example:

public class UserDataContext
{
  public UserInfo UserInfo { get; set; }
  public UserExtendedInfo UserExtendedInfo { get; set; }
}

Then in your UserControl.xaml:

<!-- Binding for the UserControl should be set in its parent, but for clarity -->
<UserControl DataContext="{Binding UserDataContext}">
  <StackPanel>
    <Grid DataContext="{Binding UserInfo}">
       <TextBlock Text="{Binding Email}" />
    </Grid>
    <Grid DataContext="{Binding UserExtendedInfo}">
       <TextBlock Text="{Binding Locale}" />
       <TextBlock Text="{Binding AboutMe}" />
    </Grid>
  </StackPanel>
</UserControl>

This assumes that your UserInfo class has a property of Email

and

That your UserExtendedInfo class has a property of Locale and AboutMe