The Canvas is the most basic layout panel in WPF. It's child elements are positioned by explicit coordinates. The coordinates can be specified relative to any side of the panel usind the Canvas.Left, Canvas.Top, Canvas.Bottom and Canvas.Right attached properties.
The panel is typically used to group 2D graphic elements together and not to layout user interface elements. This is important because specifing absolute coordinates brings you in trouble when you begin to resize, scale or localize your application. People coming from WinForms are familiar with this kind of layout - but it's not a good practice in WPF.
Override the Z-Order of Elements
Normally the Z-Order of elements inside a canvas is specified by the order in XAML. But you can override the natural Z-Order by explicity defining a Canvas.ZIndex on the element.
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