HandyControl/src/Shared/HandyControl_Shared/Themes/Styles/Base/TransferBaseStyle.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:hc="clr-namespace:HandyControl.Controls"
                    xmlns:interactivity="clr-namespace:HandyControl.Interactivity">

    <Style x:Key="TransferItemBaseStyle" BasedOn="{StaticResource BaseStyle}" TargetType="hc:TransferItem">
        <Setter Property="FocusVisualStyle" Value="{StaticResource FocusVisualMargin0}" />
        <Setter Property="HorizontalContentAlignment" Value="Stretch" />
        <Setter Property="Background" Value="{DynamicResource RegionBrush}" />
        <Setter Property="Padding" Value="{StaticResource DefaultControlPadding}" />
        <Setter Property="MinHeight" Value="{StaticResource DefaultControlHeight}" />
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="hc:TransferItem">
                    <Border CornerRadius="{Binding Path=(hc:BorderElement.CornerRadius),RelativeSource={RelativeSource TemplatedParent}}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Padding="{Binding Padding,RelativeSource={RelativeSource TemplatedParent},Converter={StaticResource ThicknessSplitConverter},ConverterParameter='1,0,1,0'}" SnapsToDevicePixels="true">
                        <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" />
                    </Border>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
        <Style.Triggers>
            <Trigger Property="IsMouseOver" Value="True">
                <Setter Property="Background" Value="{DynamicResource SecondaryRegionBrush}"/>
            </Trigger>
            <Trigger Property="IsSelected" Value="True">
                <Setter Property="Background" Value="{DynamicResource PrimaryBrush}" />
                <Setter Property="TextElement.Foreground" Value="{DynamicResource TextIconBrush}" />
            </Trigger>
            <Trigger Property="IsTransferred" Value="True">
                <Setter Property="Visibility" Value="Collapsed" />
            </Trigger>
        </Style.Triggers>
    </Style>

    <Style x:Key="TransferBaseStyle" TargetType="hc:Transfer">
        <Setter Property="Focusable" Value="False"/>
        <Setter Property="BorderThickness" Value="1"/>
        <Setter Property="Padding" Value="2" />
        <Setter Property="SelectionMode" Value="Extended"/>
        <Setter Property="hc:BorderElement.CornerRadius" Value="{StaticResource DefaultCornerRadius}"/>
        <Setter Property="BorderBrush" Value="{DynamicResource BorderBrush}"/>
        <Setter Property="ItemContainerStyle" Value="{StaticResource TransferItemBaseStyle}"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="hc:Transfer">
                    <Grid>
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition />
                            <ColumnDefinition Width="Auto"/>
                            <ColumnDefinition />
                        </Grid.ColumnDefinitions>
                        <Grid.RowDefinitions>
                            <RowDefinition/>
                            <RowDefinition/>
                            <RowDefinition/>
                            <RowDefinition/>
                        </Grid.RowDefinitions>
                        <Border Grid.RowSpan="4" Background="{TemplateBinding Background}" CornerRadius="{Binding Path=(hc:BorderElement.CornerRadius),RelativeSource={RelativeSource TemplatedParent}}" BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}">
                            <hc:ToggleBlock IsChecked="{Binding HasItems,RelativeSource={RelativeSource TemplatedParent},Mode=OneWay}" VerticalContentAlignment="Stretch" HorizontalContentAlignment="Stretch">
                                <hc:ToggleBlock.CheckedContent>
                                    <hc:ScrollViewer IsInertiaEnabled="{Binding Path=(hc:ScrollViewer.IsInertiaEnabled),RelativeSource={RelativeSource TemplatedParent}}" Focusable="false" HorizontalScrollBarVisibility="{TemplateBinding ScrollViewer.HorizontalScrollBarVisibility}" Padding="{TemplateBinding Padding}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalScrollBarVisibility="{TemplateBinding ScrollViewer.VerticalScrollBarVisibility}">
                                        <ItemsPresenter />
                                    </hc:ScrollViewer>
                                </hc:ToggleBlock.CheckedContent>
                                <hc:ToggleBlock.UnCheckedContent>
                                    <hc:Empty />
                                </hc:ToggleBlock.UnCheckedContent>
                            </hc:ToggleBlock>
                        </Border>
                        <StackPanel Margin="8,0" VerticalAlignment="Center" HorizontalAlignment="Center" Grid.Row="0" Grid.RowSpan="4" Grid.Column="1">
                            <Button hc:IconElement.Geometry="{StaticResource LeftGeometry}" Command="interactivity:ControlCommands.Cancel"/>
                            <Button hc:IconElement.Geometry="{StaticResource RightGeometry}" Margin="0,8,0,0" Command="interactivity:ControlCommands.Selected"/>
                        </StackPanel>
                        <ListBox x:Name="PART_SelectedListBox" Padding="{TemplateBinding Padding}" SelectionMode="{TemplateBinding SelectionMode}" ItemContainerStyle="{TemplateBinding ItemContainerStyle}" ItemsPanel="{TemplateBinding ItemsPanel}" Grid.Row="0" Grid.RowSpan="4" Grid.Column="2" Background="{TemplateBinding Background}" BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}" />
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

</ResourceDictionary>