ToolBar width Height changes when ToolTray Orientation changes

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WPF

I have created a form which contains tooltray containing N number for toolbar when i change the Band of any toolbar after that when i change orientation the entire band which i have changed containing toolbar width increased.

<window x:class="MainWindow" xmlns:x="#unknown">
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="350" Width="525">
    <window.resources>
        <Style TargetType="Viewbox" x:Key="StyleViewBox">
            <Style.Triggers>
                <trigger property="IsMouseOver" value="True">
                    <setter property="Width" value="100" />
                    <setter property="Height" value="100" />
                </trigger>
            </Style.Triggers>
        </Style>
    </window.resources>
    <grid>
        <grid.rowdefinitions>
            <rowdefinition></rowdefinition>
            <rowdefinition></rowdefinition>
            <rowdefinition></rowdefinition>
        </grid.rowdefinitions>
        <toolbartray x:name="ToolTray" grid.row="0" grid.rowspan="2" removed="SkyBlue">
            <toolbar band="0" bandindex="0">
                <Button Background="Aqua" Height="25" Width="25" >0</Button>
                <Button Background="BlueViolet" Height="25" Width="25" >0</Button>
                <Button Background="CornflowerBlue" Height="25" Width="25">0</Button>
            </toolbar>
            <toolbar band="0" bandindex="1">
                <Button Background="Aqua" Height="25" Width="25">1</Button>
                <Button Background="BlueViolet"  Height="25" Width="25">1</Button>
                <Button Background="CornflowerBlue" Height="25" Width="25">1</Button>
            </toolbar>
            <toolbar band="0" bandindex="2">
                <Button Background="Aqua" Height="25" Width="25">2</Button>
                <Button Background="BlueViolet" Height="25" Width="25">2</Button>
                <Button Background="CornflowerBlue" Height="25" Width="25">2</Button>
            </toolbar>
            <toolbar band="0" bandindex="3">
                <Button Background="Aqua" Height="25" Width="25">3</Button>
                <Button Background="BlueViolet" Height="25" Width="25">3</Button>
                <Button Background="CornflowerBlue" Height="25" Width="25">3</Button>
            </toolbar>
        </toolbartray>
        <Button Grid.Row="2" Height="25" Width="80" Click="Button_Click_1">Orientation</Button>
    </grid>
</window>

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Private Sub Button_Click_1(sender As Object, e As RoutedEventArgs)
        If (ToolTray.Orientation = Orientation.Horizontal) Then
            ToolTray.Orientation = Orientation.Vertical
        Else
            ToolTray.Orientation = Orientation.Horizontal
        End If
End Sub