Rectangle and Ellipse
The Rectangle and Ellipse are the two simplest shapes. To create either one, set the familiar Height and Width properties (inherited from FrameworkElement) to define the size of your shape, and then set the Fill or Stroke property (or both) to make the shape visible. You’re also free to use properties such as MinHeight, MinWidth, HorizontalAlignment, VerticalAlignment, and Margin.
Here’s a simple example that stacks an ellipse on a rectangle using a StackPanel: