You can control the overlapping of the Bars by the BarOverlapPercent
property. Please note that this property will work for bars which are from different series.
As a personal suggestion - you may use the ready to use BulletGraph
Silverlight control and integrate it in your asp.net web application. In the code behind of your ASP.NET page, you can simply render the BulletGraph control when the page loads.There are several online resources that can help you achive that.Take a look at the Todd Anglin's webcast
which describes how to integrate Silverlight controls in ASP.NET. For practical example with source code - you can review our integration demo
that vizualises our Silverlight Chart in ASP.NET page.
the Telerik team
If you want to get updates on new releases, tips and tricks and sneak peeks at our product labs directly from the developers working on the RadControls for ASP.NET AJAX, subscribe to their blog feed