Thank you for writing.
The exception that you are getting is strange. Simply after installing the latest version of our suite, navigate to Start Menu >> Programs >> Telerik >> RadControls for WinForms Q1 2011 >> Open Sample C# Solution in Visual Studio. This is the solution with all our examples from the demo application. There you can find the full imeplementation of the BubbleBar example as well.
Additionally, I have created a small video demonstrating the demo solution and the location of the bubble bar implementation.
I hope this helps. Should you have any other questions, do not hesitate to contact us.
All the best,
the Telerik team