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Learn about RibbonX, a XML markup that allows developers to customize the Office UI. It enables 3rd party developers and solution providers to build custom tabs and groups on top of the Ribbon, and target scenarios unique to and optimized for their customers. As Visio adopts the Fluent UI, Visio developers now also have the opportunity to utilize t...

If you need more flexibility in creating rich diagram mashups than offered out of the box by web part connections, you can use the Visio Services JavaScript Mashup API. In this post we'll review the breadth of possibilities by the Visio Services Mashup API and show you how to get started coding with a few simple examples.

Visio's SpatialNeighbors property is useful for finding shapes that are nearby other shapes or that overlap other shapes. It can be used to programmatically answer the question "What did I drop my shape on top of?". This blog discusses the SpatialNeighbors property.