I'm using VS 2010 Professional, Net 4.5.5...
I put a canvas in my window and I put an image in the canvas. I have the inage set to the canvas top and canvas left and I set the image with Height and Width Auto, VerticalAlignment and HorizontalAlignment = Stretch. MaxHeight and MaxWidth=Infinity.
When I run the program the image shows in the upper left corner and only covers about 1/3 of the area. Should I use something other than a canvas? I tried with just making the image the background of the window, but I couldn't figure out how to do that.

<Window x:Class="WorldClock.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"         
xmlns:sys="clr-name Title=SunSpot"         
    <local:UpdateTime x:Key="newTime"/> 
    <Style x:Key="TimeFormat" TargetType="Label"> 
         <Setter Property="FontFamily" Value="Century" /> 
         <Setter Property="FontSize" Value="10" /> 
     <Canvas Name="MainCanvas" > 
        <Image Canvas.Left="0" Canvas.Top="0" Name="World"               
        Source="/WorldClock;component/National-Geographic-World-Map.gif" /> 
While the settings don't show up in the xaml I did set them in the Properties. I deleted the automatic en tries for height and width that appeared in the Image control above because they were set to fixed values.