diff --git a/README-cn.md b/README-cn.md
index d0a470f5..0c95a29d 100644
--- a/README-cn.md
+++ b/README-cn.md
@@ -55,6 +55,7 @@
 <a href="https://github.com/varKeytrap" target="_blank"><img style="border-radius:50%!important" width="64px" alt="varKeytrap" src="https://avatars0.githubusercontent.com/u/17864005?s=64&v=4"></a>
 <a href="https://github.com/xsnakes" target="_blank"><img style="border-radius:50%!important" width="64px" alt="xsnakes" src="https://avatars1.githubusercontent.com/u/4363683?s=64&v=4"></a>
 <a href="https://github.com/mmasdivins" target="_blank"><img style="border-radius:50%!important" width="64px" alt="mmasdivins" src="https://avatars1.githubusercontent.com/u/63245359?s=64&v=4"></a>
+<a href="https://github.com/GF-Huang" target="_blank"><img style="border-radius:50%!important" width="64px" alt="GF-Huang" src="https://avatars1.githubusercontent.com/u/4510984?s=64v=4"></a>
 
 ## Backers
 
diff --git a/README.md b/README.md
index 1a2ccc4b..28263db4 100644
--- a/README.md
+++ b/README.md
@@ -55,6 +55,7 @@
 <a href="https://github.com/varKeytrap" target="_blank"><img style="border-radius:50%!important" width="64px" alt="varKeytrap" src="https://avatars0.githubusercontent.com/u/17864005?s=64&v=4"></a>
 <a href="https://github.com/xsnakes" target="_blank"><img style="border-radius:50%!important" width="64px" alt="xsnakes" src="https://avatars1.githubusercontent.com/u/4363683?s=64&v=4"></a>
 <a href="https://github.com/mmasdivins" target="_blank"><img style="border-radius:50%!important" width="64px" alt="mmasdivins" src="https://avatars1.githubusercontent.com/u/63245359?s=64&v=4"></a>
+<a href="https://github.com/GF-Huang" target="_blank"><img style="border-radius:50%!important" width="64px" alt="GF-Huang" src="https://avatars1.githubusercontent.com/u/4510984?s=64v=4"></a>
 
 ## Backers
 
diff --git a/src/Net_40/HandyControl_Net_40/Themes/Styles/Base/TreeViewBaseStyle.xaml b/src/Net_40/HandyControl_Net_40/Themes/Styles/Base/TreeViewBaseStyle.xaml
index b12fe5f4..ccb95675 100644
--- a/src/Net_40/HandyControl_Net_40/Themes/Styles/Base/TreeViewBaseStyle.xaml
+++ b/src/Net_40/HandyControl_Net_40/Themes/Styles/Base/TreeViewBaseStyle.xaml
@@ -53,10 +53,10 @@
                             <RowDefinition/>
                         </Grid.RowDefinitions>
                         <Border x:Name="Bd" CornerRadius="{Binding Path=(hc:BorderElement.CornerRadius),RelativeSource={RelativeSource TemplatedParent}}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Padding="{TemplateBinding Padding}" SnapsToDevicePixels="true">
-                            <StackPanel Orientation="Horizontal" Margin="{Binding Converter={StaticResource TreeViewItemMarginConverter}, RelativeSource={RelativeSource TemplatedParent}}">
+                            <DockPanel LastChildFill="True" Margin="{Binding Converter={StaticResource TreeViewItemMarginConverter}, RelativeSource={RelativeSource TemplatedParent}}">
                                 <ToggleButton x:Name="Expander" ClickMode="Press" IsChecked="{Binding IsExpanded, RelativeSource={RelativeSource TemplatedParent}}" Style="{StaticResource ExpandCollapseToggleStyle}"/>
                                 <ContentPresenter VerticalAlignment="Center" x:Name="PART_Header" ContentSource="Header" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
-                            </StackPanel>
+                            </DockPanel>
                         </Border>
                         <ItemsPresenter x:Name="ItemsHost" Grid.Row="1"/>
                     </Grid>
diff --git a/src/Shared/HandyControl_Shared/Themes/Styles/Base/TreeViewBaseStyle.xaml b/src/Shared/HandyControl_Shared/Themes/Styles/Base/TreeViewBaseStyle.xaml
index 336e566b..8c3f9c19 100644
--- a/src/Shared/HandyControl_Shared/Themes/Styles/Base/TreeViewBaseStyle.xaml
+++ b/src/Shared/HandyControl_Shared/Themes/Styles/Base/TreeViewBaseStyle.xaml
@@ -53,10 +53,10 @@
                             <RowDefinition/>
                         </Grid.RowDefinitions>
                         <Border x:Name="Bd" CornerRadius="{Binding Path=(hc:BorderElement.CornerRadius),RelativeSource={RelativeSource TemplatedParent}}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Padding="{TemplateBinding Padding}" SnapsToDevicePixels="true">
-                            <StackPanel Orientation="Horizontal" Margin="{Binding Converter={StaticResource TreeViewItemMarginConverter}, RelativeSource={RelativeSource TemplatedParent}}">
+                            <DockPanel LastChildFill="True" Margin="{Binding Converter={StaticResource TreeViewItemMarginConverter}, RelativeSource={RelativeSource TemplatedParent}}">
                                 <ToggleButton x:Name="Expander" ClickMode="Press" IsChecked="{Binding IsExpanded, RelativeSource={RelativeSource TemplatedParent}}" Style="{StaticResource ExpandCollapseToggleStyle}"/>
                                 <ContentPresenter VerticalAlignment="Center" x:Name="PART_Header" ContentSource="Header" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
-                            </StackPanel>
+                            </DockPanel>
                         </Border>
                         <ItemsPresenter x:Name="ItemsHost" Grid.Row="1"/>
                     </Grid>