WPF TreeView 样式
美工出了一张图。。。

没做过类似的效果啊 
给个提示 或者谁有源代码 发我一个啊
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WPF TreeView的简单使用例子
http://www.cnblogs.com/izualx/archive/2011/02/03/1949055.html
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 <Style x:Key="styleTreeViewExpandCollapse" TargetType="{x:Type ToggleButton}">

            <Setter Property="OverridesDefaultStyle" Value="True"/>

            <Setter Property="Template">

                <Setter.Value>

                    <ControlTemplate TargetType="{x:Type ToggleButton}">

                        <TextBlock x:Name="icon" VerticalAlignment="Center" TextAlignment="Right" Text="+" Cursor="Hand"/>

                        <ControlTemplate.Triggers>

                            <Trigger Property="IsChecked" Value="true">

                                <Setter TargetName="icon" Property="Text" Value="-" />

                            </Trigger>

                        </ControlTemplate.Triggers>

                    </ControlTemplate>

                </Setter.Value>

            </Setter>

        </Style>

        <Style TargetType="{x:Type TreeViewItem}">

            <Setter Property="IsExpanded" Value="{Binding IsExpanded}"/>

            <Setter Property="IsSelected" Value="false" />

            <Setter Property="Template">

                <Setter.Value>

   &