In our latest releases the background color of RadGroupBox is Transparent by default, so there is no need to use the code snippet provided by Victor if you want to have Transparent background. Still, if you, let's say, want to have a Red color for the background, the following code snippet should work without any issues in our latest release Q3 2013 SP1 (v2013.3.1127):
.radGroupBox1.GroupBoxElement.Content.Children).BackColor = Color.Red;
If you continue to experience any issues with this scenario, please open a new support ticket and send us a sample project that can demonstrate them. This will allow me to provide you with further assistance.
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