Hi David,
I am not really sure what could cause this. I tried to follow your description and I was able to run my page multiple times with the chart keeping its items. I was also able to run the wizard again and the items were preserved. Actually, the wizard generates markup like this:
Can you see such markup generated?
Alternatively, you can configure the chart using the Visual Studio property grid.
Best regards,
Ves
the Telerik team
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