ToolWindowContainer width at start up

Hi,

I'm trying your Docking component and can't find a way on how to size various ToolWindowContainers in my xaml file. As I add

ToolWindowContainer they seem to split available space equally.  How do I split 4:1 ?

       <docking:DockSite x:Name="dockSite" Grid.RowSpan="2" Grid.Row="1" Grid.ColumnSpan="2" RenderTransformOrigin="0.51,0.495">
            <!-- NOTE: Split containers can contain two elements, which are typically ToolWindowContainers (with 1 or more tool windows)
			           and one (and only one) Workspace -->
            <docking:SplitContainer>

                <docking:ToolWindowContainer>
                    <docking:ToolWindow x:Name="dockedBottom" Title="Docked Bottom">
                        <local:BridgeClub_TableListView x:Name="BridgeClub_TableListView" Margin="0" Width="Auto" Height="Auto" ScrollViewer.VerticalScrollBarVisibility="Auto" ScrollViewer.CanContentScroll="True" UseLayoutRounding="True" RenderTransformOrigin="0.5,0.5">
                            <local:BridgeClub_TableListView.Background>
                                <ImageBrush ImageSource="/SharkBridgeConsole;component/images/Extra_Tournaments_Shark_Logo.png" Opacity="0.48" Stretch="None">
                                    <ImageBrush.RelativeTransform>
                                        <TransformGroup>
                                            <ScaleTransform/>
                                            <SkewTransform/>
                                            <RotateTransform/>
                                            <TranslateTransform/>
                                        </TransformGroup>
                                    </ImageBrush.RelativeTransform>
                                </ImageBrush>
                            </local:BridgeClub_TableListView.Background>
                        </local:BridgeClub_TableListView>
                    </docking:ToolWindow>
                </docking:ToolWindowContainer>

                <docking:ToolWindowContainer x:Name="Tool_Userlist" HasCloseButton="False" HasTitleBarGripper="True" IsTabLayoutAnimationEnabled="True">
                    <docking:ToolWindow x:Name="dockedRight" Title="Docked Right">
                        <local:BridgeClub_LobbyUserList x:Name="BridgeClub_LobbyUserList" Margin="1,1,1,1.5" Width="Auto" Height="Auto" Grid.Row="2" Padding="0" FontSize="18" Grid.Column="1" IsEnabled="{Binding ConnectedConsole}"/>
                    </docking:ToolWindow>
                </docking:ToolWindowContainer>

            </docking:SplitContainer>

        </docking:DockSite>