Thank you for writing.
In Q22012 RadChart has been removed from the toolbox, however it is still part of our suite and can be used. To show it in the toolbox you should create a new class containing the following code:
MyRadChart : RadChart
Once you build your project, the control will appear in your toolbox and you will be able to use it with all its design time features.
Nonetheless, please have in mind that RadChart is considered a deprecated control. Throughout the years we have identified a number of limitations and deficiencies in this control. To address them we have designed RadChartView - a new control that replies on a completely different chart engine. RadChartView is still under development, however, we will do our best to introduce the same set of functionality and features as soon as possible. The fact that RadChartView and RadChart stand upon on different engines implies that there is not a straightforward migration path from one to the other. In general we encourage you to use the new RadChartView control for any new project development that you are starting now.
More information is available here: http://www.telerik.com/help/winforms/chartview-radchartview-vs.-radchart.html
the Telerik team