I have a RadHTML chart that has series added programmaticly in code-behind (C# ASP.NET) to the chart when a user clicks button on the webpage. If the end-user initiates a postback event (by changing the selected-index on a drop-down list element for example), the series data is lost. The legend still appears with the correct series, as does the XAxis labels, but the actual series data disappears, no lines appear on the chart. I've already checked to see if I have a hanging Series.Clear() and ViewState is set to True.