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I have a window where I add a new UserControl to (with an image), I simply want to center the control in the middle of the screen (both vertically and horizontally). I can only get the vertical one to work. I'm gonna swap content in the DockPanel from my CodeBehind and want to show this startup screen before I start doing my slideshow UI, this means that the content is set from the CodeBehind. My Window : <Window x:Class="GreenWebPlayerWPF.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Window1" Height="512" Width="853" WindowStyle="None" WindowState="Maximized" WindowStartupLocation="CenterScreen"> <DockPanel Width="Auto" Height="Auto" Name="TransitionContainer" Background="Black" Margin="0" LastChildFill="True"></DockPanel> </Window> My UserControl : <UserControl x:Class="GreenWebPlayerWPF.FrontPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> <DockPanel Background="Black"> <Image Name="image1" Stretch="None" Source="/GreenWebPlayerWPF;component/gw.png" /> </DockPanel> </UserControl> Please note that I'm using maximized/full screen.

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