Shrlalgo.RvKits/Wpf.Ui.Extend/Controls/TreeComboBox/TreeComboBox.xaml

<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:exc="clr-namespace:Wpf.Ui.Extend.Controls">

    <Style TargetType="{x:Type exc:TreeComboBox}">
        <!--<Setter Property="SnapsToDevicePixels"
          Value="true" />-->
        <!--<Setter Property="OverridesDefaultStyle"
          Value="true" />-->
        <Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto" />
        <Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto" />
        <Setter Property="ScrollViewer.CanContentScroll" Value="true" />
        <Setter Property="MinWidth" Value="120" />
        <Setter Property="MinHeight" Value="20" />
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type exc:TreeComboBox}">
                    <Grid>
                        <ToggleButton
                            x:Name="ToggleButton"
                            ClickMode="Press"
                            Focusable="false"
                            IsChecked="{Binding IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}"
                            Template="{StaticResource ComboBoxToggleButton}" />
                        <Grid IsHitTestVisible="False">
                            <ItemsControl
                                x:Name="ContentSite"
                                Margin="3,3,23,3"
                                HorizontalAlignment="Left"
                                VerticalAlignment="Center"
                                HorizontalContentAlignment="Center"
                                VerticalContentAlignment="Center"
                                ItemTemplate="{TemplateBinding ItemTemplate}"
                                ItemTemplateSelector="{TemplateBinding ItemTemplateSelector}"
                                ItemsSource="{Binding SelectedItems, RelativeSource={RelativeSource Mode=TemplatedParent}}">
                                <ItemsControl.ItemsPanel>
                                    <ItemsPanelTemplate>
                                        <WrapPanel Orientation="Horizontal" />
                                    </ItemsPanelTemplate>
                                </ItemsControl.ItemsPanel>

                            </ItemsControl>
                        </Grid>
                        <TextBox
                            x:Name="PART_EditableTextBox"
                            Margin="3,3,23,3"
                            HorizontalAlignment="Left"
                            VerticalAlignment="Bottom"
                            Background="Transparent"
                            Focusable="True"
                            IsReadOnly="{TemplateBinding IsReadOnly}"
                            Style="{x:Null}"
                            Template="{StaticResource ComboBoxTextBox}"
                            Visibility="Hidden" />
                        <Popup
                            x:Name="Popup"
                            AllowsTransparency="True"
                            Focusable="False"
                            IsOpen="{TemplateBinding IsDropDownOpen}"
                            Placement="Bottom"
                            PopupAnimation="Slide">
                            <Grid
                                x:Name="DropDown"
                                MinWidth="{TemplateBinding ActualWidth}"
                                MaxHeight="{TemplateBinding MaxDropDownHeight}"
                                SnapsToDevicePixels="True">
                                <Border x:Name="DropDownBorder" BorderThickness="1">
                                    <!--<Border.BorderBrush>
                                        <SolidColorBrush Color="{DynamicResource BorderMediumColor}" />
                                    </Border.BorderBrush>
                                    <Border.Background>
                                        <SolidColorBrush Color="{DynamicResource ControlLightColor}" />
                                    </Border.Background>-->
                                </Border>
                                <ScrollViewer Margin="4,6,4,6" SnapsToDevicePixels="True">
                                    <exc:ExtendedTreeView
                                        x:Name="treeView"
                                        IsCheckedPath="{TemplateBinding IsCheckedPath}"
                                        IsExpandedPath="{TemplateBinding IsExpandedPath}"
                                        IsSelectedPath="{TemplateBinding IsSelectedPath}"
                                        ItemTemplate="{TemplateBinding ItemTemplate}"
                                        ItemsSource="{TemplateBinding ItemsSource}" />
                                </ScrollViewer>
                            </Grid>
                        </Popup>
                        <VisualStateManager.VisualStateGroups>
                            <VisualStateGroup x:Name="CommonStates">
                                <VisualState x:Name="Normal" />
                                <VisualState x:Name="MouseOver" />
                                <VisualState x:Name="Disabled">
                                    <Storyboard>
                                        <ColorAnimationUsingKeyFrames Storyboard.TargetName="PART_EditableTextBox" Storyboard.TargetProperty="(TextElement.Foreground).                       (SolidColorBrush.Color)">
                                            <EasingColorKeyFrame KeyTime="0" Value="{StaticResource DisabledForegroundColor}" />
                                        </ColorAnimationUsingKeyFrames>
                                    </Storyboard>
                                </VisualState>
                            </VisualStateGroup>
                            <VisualStateGroup x:Name="EditStates">
                                <VisualState x:Name="Editable">
                                    <Storyboard>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="PART_EditableTextBox" Storyboard.TargetProperty="(UIElement.Visibility)">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{x:Static Visibility.Visible}" />
                                        </ObjectAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentSite" Storyboard.TargetProperty="(UIElement.Visibility)">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{x:Static Visibility.Hidden}" />
                                        </ObjectAnimationUsingKeyFrames>
                                    </Storyboard>
                                </VisualState>
                                <VisualState x:Name="Uneditable" />
                            </VisualStateGroup>
                        </VisualStateManager.VisualStateGroups>
                    </Grid>
                    <ControlTemplate.Triggers>
                        <Trigger Property="HasItems" Value="false">
                            <Setter TargetName="DropDownBorder" Property="MinHeight" Value="95" />
                        </Trigger>
                        <Trigger Property="IsGrouping" Value="true">
                            <Setter Property="ScrollViewer.CanContentScroll" Value="false" />
                        </Trigger>
                        <Trigger SourceName="Popup" Property="AllowsTransparency" Value="true">
                            <Setter TargetName="DropDownBorder" Property="CornerRadius" Value="4" />
                            <Setter TargetName="DropDownBorder" Property="Margin" Value="0,2,0,0" />
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</ResourceDictionary>