ChartArea.ItemWidthPercent is a DependencyProperty within a RadChart, but setting it after a chart is drawn has no visible effect, only if it is set to the desired value before the RadChart is drawn. I've tried setting it in bindings, as well as setting it manually with code-behind driven by WPF events to no avail. Is this intended behavior? Am I missing something that must be done (will post code if needed)? Or is it simply that once the chart has been rendered, it must be re-rendered to take into effect some changes?