In using polygon maps you need to add the polygon ID and grouping ID to details and the sequenced point ID to path in order to display your own custom group map. When you want to overlay a second axes with another dimension like below example (department pie charts), you need to make sure that that dimension is also available in your polygon data source. Simply blending polygon and sales data will not work, you need to join the data sources before extracting.
can you help me please to resolve this issue : http://community.tableau.com/thread/158506
i tried to do as you describe in your post but it’s doesn’t work for me !