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Proband_Datagrid.Items.Add(new ProbandName() { FirstName = "Silvia", LastName = "Reisinger", Boss = true });
                Proband_Datagrid.Items.Add(new ProbandName() { FirstName = "Peter", LastName = "Weinzierl", Boss =true });
                Proband_Datagrid.Items.Add(new ProbandName() { FirstName = "Hans", LastName = "Müller", Boss = true });                    

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 <DataGrid x:Name="Proband_Datagrid" HorizontalAlignment="Left" Margin="655,135,0,0" VerticalAlignment="Top" Height="295" Width="605" ItemsSource="{Binding}" AutoGenerateColumns="False" SelectionChanged="Proband_Datagrid_SelectionChanged">
            <DataGrid.Columns>
                <DataGridTextColumn Header="Vorname" Binding ="{Binding FirstName}" Width="Auto" />
                <DataGridTextColumn Header="Nachname" Binding="{Binding LastName}" Width="Auto"/>
                <DataGridCheckBoxColumn Header="ist Boss" Binding="{Binding IsBoss}" Width="SizeToHeader"/>
            </DataGrid.Columns>
        </DataGrid>