Organising TabItems vertically don't change they layout. about dragablz HOT 5 CLOSED

<Window x:Class="MaterialDesignTabExample.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:dragablz="clr-namespace:Dragablz;assembly=Dragablz"
        Title="Material Design Demo" Height="350" Width="525">
    <Window.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="pack://application:,,,/Dragablz;component/themes/materialdesign.xaml" />
            </ResourceDictionary.MergedDictionaries>            
        </ResourceDictionary>
    </Window.Resources>
    <dragablz:TabablzControl TabStripPlacement="Left">
        <dragablz:TabablzControl.ItemContainerStyle>
            <Style TargetType="{x:Type dragablz:DragablzItem}" BasedOn="{StaticResource MaterialDesignDragableTabItemVerticalStyle}">
                <Setter Property="Width" Value="100" />
                <Setter Property="Height" Value="40" />
            </Style>
        </dragablz:TabablzControl.ItemContainerStyle>
        <dragablz:TabablzControl.InterTabController>
            <dragablz:InterTabController />
        </dragablz:TabablzControl.InterTabController>
        <TabItem Header="HELLO">
            <TextBlock HorizontalAlignment="Center" VerticalAlignment="Center">Hello World</TextBlock>
        </TabItem>
        <TabItem Header="MATERIAL">
            <TextBlock HorizontalAlignment="Center" VerticalAlignment="Center">Material Design</TextBlock>
        </TabItem>
        <TabItem Header="DESIGN">
            <TextBlock HorizontalAlignment="Center" VerticalAlignment="Center">Looks Quite Nice</TextBlock>
        </TabItem>
    </dragablz:TabablzControl>
</Window>