Multiple colors in a single Visio shape

In general Visio shapes have always supported a single solid colour and if you want two or more colors you need to group shapes together.  There are some tricks using shadow offsets to add another color, but by and large it’s one color per shape.  Visio 2013 changes that by introducing gradients and, aside from the standard use for gradients, this allows you to create regions of different colors across the shape.