WPF

<DataGrid Grid.Row="1"
           Grid.Column="0"
           ItemsSource="{Binding JobPhases}"
           SelectedItem="{Binding SelectedJobPhase}"
           SelectionMode="Single"
           SelectionUnit="Cell"
           CanUserAddRows="False"
           CanUserReorderColumns="False"
           CanUserResizeColumns="True"
           CanUserResizeRows="False"
           CanUserSortColumns="True"
           AutoGenerateColumns="False"
           AlternatingRowBackground="Gainsboro"
           IsSynchronizedWithCurrentItem="True"
           AlternationCount="2"
           FontSize="12"
           IsReadOnly="False"
           FontWeight="Normal"
           FontStyle="Normal">

     <DataGrid.Columns>

         <DataGridComboBoxColumn Header="Phase Type"
                                 SelectedItemBinding="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}}, Path=DataContext.SelectedJobPhaseType}"
                                 DisplayMemberPath="Caption"
                                 Width="150">

             <DataGridComboBoxColumn.EditingElementStyle>
                 <Style TargetType="{x:Type ComboBox}">
                     <Setter Property="ItemsSource" Value="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}}, Path=DataContext.JobPhaseTypes}"/>
                     <Setter Property="IsReadOnly" Value="True"/>
                     <Setter Property="StaysOpenOnEdit" Value="True" />
                 </Style>
             </DataGridComboBoxColumn.EditingElementStyle>

             <DataGridComboBoxColumn.ElementStyle>
                 <Style TargetType="{x:Type ComboBox}">
                     <Setter Property="ItemsSource" Value="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}}, Path=DataContext.JobPhaseTypes}"/>
                 </Style>
             </DataGridComboBoxColumn.ElementStyle>

         </DataGridComboBoxColumn>

     </DataGrid.Columns>

 </DataGrid>

<ItemsControl Name="lwChannels"    
                      ItemsSource="{Binding ElementName=userControl, Path=Channels}"
                      FocusVisualStyle="{x:Null}"
                      ScrollViewer.CanContentScroll="True"
                      VirtualizingPanel.IsVirtualizing="True">
            <ItemsControl.Template>
                <ControlTemplate>
                        <UI:ScrollviewerX HorizontalScrollBarVisibility="Disabled" 
                                          VerticalScrollBarVisibility="Hidden">
                            <ItemsPresenter />
                        </UI:ScrollviewerX>
                </ControlTemplate>
            </ItemsControl.Template>
            <ItemsControl.ItemsPanel>
                <ItemsPanelTemplate>
                    <VirtualizingStackPanel Orientation="Vertical" IsItemsHost="True" />
                </ItemsPanelTemplate>
            </ItemsControl.ItemsPanel>
            <ItemsControl.ItemTemplate>
                <DataTemplate>
                    <!-- PROGRAMS -->
                    <ItemsControl ItemsSource="{Binding Programs}"                                        
                                  Height="{Binding ElementName=userControl, Path=RowHeight}"                                 
                                  ScrollViewer.CanContentScroll="True"
                                  VirtualizingPanel.IsVirtualizing="True"
                                  VirtualizingPanel.ScrollUnit="Pixel">
                        <ItemsControl.Template>
                            <ControlTemplate>
                                    <UI:ScrollviewerX HorizontalScrollBarVisibility="Hidden" 
                                                      VerticalScrollBarVisibility="Disabled"                                                       
                                                      PreviewKeyDown="OnScrollViewerPreviewKeyDown" 
                                                      ScrollChanged="ScrollviewerX_ScrollChanged" >
                                        <ItemsPresenter />
                                    </UI:ScrollviewerX>
                            </ControlTemplate>
                        </ItemsControl.Template>
                        <ItemsControl.ItemsPanel>
                            <ItemsPanelTemplate>
                                <VirtualizingStackPanel Orientation="Horizontal" IsItemsHost="True"/>
                            </ItemsPanelTemplate>
                        </ItemsControl.ItemsPanel>
                        <ItemsControl.ItemTemplate>
                            <DataTemplate>
                                <!-- PROGRAM -->
                                <Label Content="{Binding Path=Title}"  
                                   BorderThickness="2"
                                   MouseDown="OnProgramMouseDown"                                                        
Initialized="OnProgramInitialized"/>
                            </DataTemplate>
                        </ItemsControl.ItemTemplate>
                    </ItemsControl>
                </DataTemplate>
            </ItemsControl.ItemTemplate>
        </ItemsControl>