Expander

 <StackPanel Margin="20,20" Width="100" Height="460" HorizontalAlignment="Left"
             VerticalAlignment="Top">
     <Expander VerticalAlignment="Stretch" ExpandDirection="Down" HorizontalContentAlignment="Left" SnapsToDevicePixels="True">
         <Expander.Header>
             <TextBlock Text="用户管理" FontSize="14" FontWeight="Bold" />
         </Expander.Header>
         <Expander.Content>
             <Grid>
                 <Grid.RowDefinitions>
                     <RowDefinition Height="auto"/>
                     <RowDefinition Height="auto"/>
                 </Grid.RowDefinitions>
                 <RadioButton Grid.Row="0">会员管理</RadioButton>
                 <RadioButton Grid.Row="1">角色管理</RadioButton>
             </Grid>
         </Expander.Content>
     </Expander>
     <Expander VerticalAlignment="Stretch" ExpandDirection="Down" HorizontalContentAlignment="Left" SnapsToDevicePixels="True">
         <Expander.Header>
             <TextBlock Text="文档管理" FontSize="14" FontWeight="Bold" />
         </Expander.Header>
         <Expander.Content>
             <Grid>
                 <Grid.RowDefinitions>
                     <RowDefinition Height="auto"/>
                     <RowDefinition Height="auto"/>
                     <RowDefinition Height="auto"/>
                 </Grid.RowDefinitions>
                 <RadioButton Grid.Row="0">部门资料</RadioButton>
                 <RadioButton Grid.Row="1">员工资料</RadioButton>
                 <RadioButton Grid.Row="2">职位资料</RadioButton>
             </Grid>
         </Expander.Content>
     </Expander>
     <Expander VerticalAlignment="Stretch" ExpandDirection="Down" HorizontalContentAlignment="Left" SnapsToDevicePixels="True">
         <Expander.Header>
             <TextBlock Text="采购管理" FontSize="14" FontWeight="Bold" />
         </Expander.Header>
         <Expander.Content>
             <Grid>
                 <Grid.RowDefinitions>
                     <RowDefinition Height="auto"/>
                     <RowDefinition Height="auto"/>
                     <RowDefinition Height="auto"/>
                     <RowDefinition Height="auto"/>
                     <RowDefinition Height="auto"/>
                 </Grid.RowDefinitions>
                 <RadioButton Grid.Row="0">采购计划</RadioButton>
                 <RadioButton Grid.Row="1">需求分析</RadioButton>
                 <RadioButton Grid.Row="2">采购单</RadioButton>
                 <RadioButton Grid.Row="3">入库验收</RadioButton>
                 <RadioButton Grid.Row="4">入库退回</RadioButton>
             </Grid>
         </Expander.Content>
     </Expander>
     <Expander VerticalAlignment="Stretch" ExpandDirection="Down" HorizontalContentAlignment="Left" SnapsToDevicePixels="True">
         <Expander.Header>
             <TextBlock Text="供应商" FontSize="14" FontWeight="Bold" />
         </Expander.Header>
         <Expander.Content>
             <Grid>
                 <Grid.RowDefinitions>
                     <RowDefinition Height="auto"/>
                     <RowDefinition Height="auto"/>
                     <RowDefinition Height="auto"/>
                 </Grid.RowDefinitions>
                 <RadioButton Grid.Row="0">基本资料</RadioButton>
                 <RadioButton Grid.Row="1">往来单位</RadioButton>
                 <RadioButton Grid.Row="2">上游供应商</RadioButton>
             </Grid>
         </Expander.Content>
     </Expander>
 </StackPanel>