Hi nyinyithann,

A sample where a custom template's been applied to the xamMap control and its panes could be found here:
http://labs.infragistics.com/silverlightdv/2010.3/#/Samples/Map/Styling/Office2010Theme

The Office 2010 Blue Theme is a part of our 10.3 release. If you like, you can download NetAdvantage for Silverlight Data Visualization 2010 Vol. 3 Samples from our site (http://es.infragistics.com/dotnet/netadvantage/silverlight/data-visualization.aspx#Downloads).

Hope that helps,
Milana Zhileva