I would like to create a toolbar like this on wpf.

What i need to use in order to create the area with the button circled in red ? Is it possible with the microsoft toolbar ?
For the moment i tried this :

Here is my xaml code :
<ToolBarTray Background="#008ede" HorizontalAlignment="Stretch" VerticalAlignment="Top" Height="33" >
<ToolBar ToolBarTray.IsLocked="True" Background="#008ede" HorizontalAlignment="Stretch" VerticalAlignment="Center" VerticalContentAlignment="Center">
<Button Name="tbrClear" ToolTip="Clear" VerticalAlignment="Center">
<Image Source="_XWPF_TBR_PREMIER.PNG_IMAGES.png" Name="Image1"></Image>
</Button>
<Button Name="tbrClear_" ToolTip="Clear" VerticalAlignment="Center" VerticalContentAlignment="Center">
<Image Source="_XWPF_TBR_PRECED.PNG_IMAGES.png" Name="Image2"></Image>
</Button>
</ToolBar>
</ToolBarTray>
1) First, i would like to know how centered the button, i add the verticalAlignment="Center", but nothing is center. Have you an idea please?
2) Secondly, how remove or hide the little rectangle white on the right please ?
3) Then, anyone know how it's possible to recreate the area circled on red please ?
Thanks a lot :)
Best regards