WatermarkTextBox

<!-- xmlns:xctk="clr-namespace:Xceed.Wpf.Toolkit;assembly=Xceed.Wpf.Toolkit" -->
<Window xmlns:xctk="http://schemas.xceed.com/wpf/xaml/toolkit">
    <xctk:WatermarkTextBox Watermark="My Watermark" />

AvalonDock

<Window xmlns:xcad="http://schemas.xceed.com/wpf/xaml/avalondock">
    <xcad:DockingManager>
        <xcad:DockingManager.Theme>
            <xcad:VS2010Theme />
        </xcad:DockingManager.Theme>

Installation via NuGet

Assembly ajoutées
Xceed.Wpf.AvalonDock
Xceed.Wpf.AvalonDock.Themes.Aero
Xceed.Wpf.AvalonDock.Themes.Metro
Xceed.Wpf.AvalonDock.Themes.VS2010
Xceed.Wpf.DataGrid
Xceed.Wpf.Toolkit