This error appears because the brushedMetal
image file could not be found. Just add it as a project resource and you should be set. The image can be located at: C:\Program Files\Telerik\RadControls for WinForms Q3 2007\Examples\Resources\brushedMetal.jpg
What you should do next is change the resource path to the resource. Here is the pattern:
|this.panel1.BackgroundImage = global::YourProjectNamespace.Properties.Resources.brushedMetal;
If you need further assistance, do not hesitate to contact us.
the Telerik team