If the user starts the app there should be a annimated background. The Background of the Maingrid is that picture above. The background should be moved. How can I do this in Visual Blend? I'm aware of how to create annimations in blend but I don't know how to do this kind of annimation.
I believe you are looking for something along the lines of this:
<Canvas.Resources>
<Storyboard x:Name="myStoryboard">
<!-- The PointAnimation has a name so it can be accessed
from code. The To property is left out of the XAML
because the value of To is determined in code. -->
<PointAnimation
x:Name="clockAnimation"
Storyboard.TargetProperty="Center"
Storyboard.TargetName="clockImage"
Duration="0:0:20"/>
</Storyboard>
</Canvas.Resources>
And this C# which can be done on a timer or on initialisation:
double newX = 'Where you want the new X coordinate of the clock';
double newY = 'Where you want the new Y coordinate of the clock';
Point myPoint = new Point();
myPoint.X = newX;
myPoint.Y = newY;
clockAnimation.To = myPoint;
myStoryboard.Begin();
I hope this works for you!