When create a .Net 4.0 WPF project in Visual Studio 2013 and drag the RadCartesianChart from the ToolBox, the version of the Chart.dll is 4.5 Reason for closing the item: The version of Telerik binaries available in the ToolBox could be changed easily trough the Toolbox configurator in Visual Studio. To do this you can follow the steps below: - Open Telerik menu in Visual Studio - Choose “UI for WPF” and then click “Launch Toolbox Configurator” - From the DropDown menu could be changed the .Net framework version of Telerik binaries displayed in the Toolbox