In cases when you are creating RadPanels run-time, you should set the ThemeName property to "Office2007Blue":
|RadPanel panel1 = new RadPanel();
|panel1.Text = "Run-time created RadPanel";
|panel1.Location = new Point(0, 0);
|panel1.Size = new Size(300, 300);
|panel1.ThemeName = "Office2007Blue";
I have attached a sample application which demonstrates this behavior. If you have additional questions, feel free to contact me.
the Telerik team