Hello Justin,
You can achieve this scenario by creating a composite field in your business object that presents concatenated Date and Category like this:
Setting the XCategory item mapping to this field will map the item to a separate bar the same way like in your image. Your series mapping can look like this:
Hope this helps!
Best wishes,
Yavor Ivanov
the Telerik team
Q3’10 SP1 of RadControls for WinForms is available for
download; also available is the Q1'11
Roadmap for Telerik Windows Forms controls.