该怎么样调整布局呢？

    <DockPanel Height="800" Width="600">
        <StackPanel DockPanel.Dock="Top"  Orientation="Horizontal" Width="600">
            <Button Content="打开" Command="{Binding OpenWellCommand}"/>
            <Button Command="{Binding CalcCommand}"  Content="保存"/>
            <Button Content="退出" Command="{Binding CloseCommand}"/>
        </StackPanel>
        <TabControl Height="780" VerticalAlignment="Top">
            <TabItem Header="送井">
                <DataGrid VerticalAlignment="Top" IsReadOnly="True" ItemsSource="{Binding Path=WellStructure.Segments}" AutoGenerateColumns="False" CanUserReorderColumns="False" CanUserSortColumns="False" AlternationCount="1" Height="200" Width="600">
                    <DataGrid.ColumnHeaderStyle>
                        <Style TargetType="DataGridColumnHeader">
                            <Setter Property="HorizontalContentAlignment"  Value="Center"/>
                        </Style>
                    </DataGrid.ColumnHeaderStyle>
                    <DataGrid.Columns>
                        <DataGridTextColumn Header="序号" Binding="{Binding DrillSequence}">
                        </DataGridTextColumn>
                        <DataGridTextColumn Header="钻具名称" Binding="{Binding CasingName}" />
                        <DataGridTextColumn Binding="{Binding CasingSize}">
                            <DataGridTextColumn.Header>
                                <StackPanel>
                                    <TextBlock Text="编号" VerticalAlignment="Stretch" HorizontalAlignment="Center" />
                                </StackPanel>
                            </DataGridTextColumn.Header>
                        </DataGridTextColumn>
                        <DataGridTextColumn Binding="{Binding CasingLength}">
                            <DataGridTextColumn.Header>
                                <StackPanel>
                                    <TextBlock Text="钻具外径" VerticalAlignment="Stretch" HorizontalAlignment="Center" />
                                </StackPanel>
                            </DataGridTextColumn.Header>
                        </DataGridTextColumn>
                        <DataGridTextColumn Binding="{Binding CassingThickness}">
                            <DataGridTextColumn.Header>
                                <StackPanel>
                                    <TextBlock Text="数量" VerticalAlignment="Stretch" HorizontalAlignment="Center" />
                                </StackPanel>
                            </DataGridTextColumn.Header>
                        </DataGridTextColumn>
                        <DataGridTextColumn Binding="{Binding CasingSettingDepth}">
                            <DataGridTextColumn.Header>
                                <StackPanel>
                                    <TextBlock Text="型号" VerticalAlignment="Stretch" HorizontalAlignment="Center" />
                                </StackPanel>
                            </DataGridTextColumn.Header>
                        </DataGridTextColumn>
                              
                    </DataGrid.Columns>
                </DataGrid>
            </TabItem>
            <TabItem Header="下井">
                <DataGrid VerticalAlignment="Top" IsReadOnly="True" ItemsSource="{Binding BHA}" AlternationCount="1" AutoGenerateColumns="False"
                          CanUserSortColumns="False" Width="600" Height="200">
                    <DataGrid.Columns>
                        <DataGridTextColumn Header="钻具序号" Binding="{Binding OrderNum}"/>
                        <DataGridTextColumn Header="钻具名称" Binding="{Binding ToolName}" />
                        <DataGridTextColumn Binding="{Binding OD}">
                            <DataGridTextColumn.Header >
                                <StackPanel HorizontalAlignment="Center">
                                    <TextBlock Text="钻井外径" VerticalAlignment="Stretch" HorizontalAlignment="Center" />
                                    <TextBlock Text="(mm)" VerticalAlignment="Stretch" HorizontalAlignment="Center" />
                                </StackPanel>
                            </DataGridTextColumn.Header>
                        </DataGridTextColumn>
                    </DataGrid.Columns>
                </DataGrid>
            </TabItem>
            <TabItem Header="倒换">
                <DataGrid VerticalAlignment="Top" IsReadOnly="True" ItemsSource="{Binding BHA}" AlternationCount="1" AutoGenerateColumns="False"
                          CanUserSortColumns="False" Width="600" Height="200">
                    <DataGrid.Columns>
                        <DataGridTextColumn Header="钻具序号" Binding="{Binding OrderNum}"/>
                        <DataGridTextColumn Header="钻具名称" Binding="{Binding ToolName}" />
                        <DataGridTextColumn Binding="{Binding OD}">
                            <DataGridTextColumn.Header >
                                <StackPanel HorizontalAlignment="Center">
                                    <TextBlock Text="钻井外径" VerticalAlignment="Stretch" HorizontalAlignment="Center" />
                                    <TextBlock Text="(mm)" VerticalAlignment="Stretch" HorizontalAlignment="Center" />
                                </StackPanel>
                            </DataGridTextColumn.Header>
                        </DataGridTextColumn>
                        <DataGridTextColumn Binding="{Binding InD}">
                            <DataGridTextColumn.Header >
                                <StackPanel HorizontalAlignment="Center">
                                    <TextBlock Text="钻井内径" VerticalAlignment="Stretch" HorizontalAlignment="Center" />
                                    <TextBlock Text="(mm)" VerticalAlignment="Stretch" HorizontalAlignment="Center" />
                                </StackPanel>
                            </DataGridTextColumn.Header>
                        </DataGridTextColumn>
                        <DataGridTextColumn Binding="{Binding Length}">
                            <DataGridTextColumn.Header >
                                <StackPanel HorizontalAlignment="Center">
                                    <TextBlock Text="钻井长度" VerticalAlignment="Stretch" HorizontalAlignment="Center" />
                                    <TextBlock Text="(m)" VerticalAlignment="Stretch" HorizontalAlignment="Center" />
                                </StackPanel>
                            </DataGridTextColumn.Header>
                        </DataGridTextColumn>
               </DataGrid.Columns>
                </DataGrid>
            </TabItem>
        </TabControl>
        <StackPanel DockPanel.Dock="Top" Orientation="Vertical">
        <GroupBox Height="200" DockPanel.Dock="Top">
            <GroupBox.Header>
                <TextBlock Text="统计（按类型）" FontSize="14" FontWeight="Bold"  />
            </GroupBox.Header>
      <DataGrid IsReadOnly="True" ItemsSource="{Binding Path=WellStructure.Segments}" AutoGenerateColumns="False" CanUserReorderColumns="False" CanUserSortColumns="False" AlternationCount="1" Height="530" Width="569">
            <DataGrid.ColumnHeaderStyle>
                <Style TargetType="DataGridColumnHeader">
                    <Setter Property="VerticalContentAlignment"  Value="Top" />
                </Style>
            </DataGrid.ColumnHeaderStyle>
            <DataGrid.Columns>
                <DataGridTextColumn Header="序号" Binding="{Binding DrillSequence}">
                </DataGridTextColumn>
                <DataGridTextColumn Binding="{Binding BitSize}">
                    <DataGridTextColumn.Header >
                        <StackPanel HorizontalAlignment="Center">
                            <TextBlock Text="井名称" VerticalAlignment="Stretch" HorizontalAlignment="Center" />
                        </StackPanel>
                    </DataGridTextColumn.Header>
                </DataGridTextColumn>
                <DataGridTextColumn Binding="{Binding WellDepth}" Width="60">
                    <DataGridTextColumn.Header>
                        <StackPanel HorizontalAlignment="Center">
                            <TextBlock Text="钻具名称" HorizontalAlignment="Center" />
                        </StackPanel>
                    </DataGridTextColumn.Header>
                </DataGridTextColumn>
                <DataGridTextColumn Header="编号" Binding="{Binding CasingName}" />
                <DataGridTextColumn Binding="{Binding CasingSize}">
                    <DataGridTextColumn.Header>
                        <StackPanel>
                            <TextBlock Text="钻具外径" VerticalAlignment="Stretch" HorizontalAlignment="Center" />
                        </StackPanel>
                    </DataGridTextColumn.Header>
                </DataGridTextColumn>
                <DataGridTextColumn Binding="{Binding CasingLength}">
                    <DataGridTextColumn.Header>
                        <StackPanel>
                            <TextBlock Text="累计" VerticalAlignment="Stretch" HorizontalAlignment="Center" />
                        </StackPanel>
                    </DataGridTextColumn.Header>
                </DataGridTextColumn>
            </DataGrid.Columns>
        </DataGrid>
        </GroupBox>
        </StackPanel>
    </DockPanel>
wpf页面中不显示统计及下面的相关内容，我如果想把统计和上面的按钮打开、保存、退出竖直相对，调了很长时间还没有眉目。请各位帮帮忙。