Hi Trinh,
Unfortunately we must confirm that there are some interoperability problems with RadChart and EntitySpaces that prevent the control to successfully bind to esDataSource control at the moment. We have logged your feedback and we will forward it to our developers so the problems are addressed for one of the future versions of the control.
Sorry for the inconvenience. We have updated your Telerik points for the report.
Greetings,
Manuel
the Telerik team