I am sorry to inform you that quite a few elements are not appearing in MS Visio 2010 - I have just tried the stencil, but I don't know yet what is the cause. The BPMN 1.2 Modeler for Visio supports the complete set.
It is a comprehensive user friendly package. My intention is to continue amending this stencil and upgrade it to full BPMN 2.0 capabilities, I will surely inform you when a new version is ready. The BPMN 1.2 Modeler for Visio is a standalone Visio extension to draw and model business processes. The stencil (in zipped format) is accessible here: Flowcharts can help you see whether the steps of a process are logical, uncover problems or miscommunications, define.
Flowcharts are particularly useful for displaying how a process currently flow or could ideally function. As sometimes I use other signs on models some other (non-BPMN) elements are also included in the stencil, feel free to remove them :) Flowchart is widely used in business, education and economic presentations to help the audience visualize the content better, or to find flaws in a process flow diagrams. Now it is my time to contribute and I am happy to present the amended stencil which includes some (not all) of the BPMN 2.0 compliant element, including Coreographies and Conversations. Many months (could be years) ago I have found a great stencil for MS Visio (any version) which helped me a lot in modelling BPMN 1.2 processess.