Canvas.Bottom Attached Property
.NET Framework 4.6 and 4.5
Gets or sets a value that represents the distance between the bottom of an element and the bottom of its parent Canvas.
PresentationFramework (in PresentationFramework.dll)
A Double that represents the offset position from the bottom of a parent Canvas. The default value is NaN.
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The Bottom offset of a child element does not affect the size of a parent Canvas.
If you specify them, the attached properties Canvas.Top or Canvas.Left take priority over the Canvas.Bottom or Canvas.Right properties.