Hello Phillip Hamlyn,
It's good to hear that you found the code of the demo.
For RadRichTextBoxRibbonUI to work as expected, you must verify that control in your toolbox is added from the default install directory of Telerik controls. The magic only happens when Visual Studio is able to load the assembly Telerik.Windows.Controls.RichTextBoxUI.VisualStudio.Design.dll
located generally here:
<program files folder>Telerik\RadControls for Silverlight Q2 2010\Binaries\Silverlight\design
If you are unsure, you may drag Telerik.Windows.Controls.RichTextBoxUI.dll from default install directory to toolbox and use the item added in toolbox from this operation.
If VS is not able to find the designer-related dll, RadRichTextBoxRibbonUI will behave as you reported.
Otherwise, the editing UI XAML should be auto-generated when you drop the component onto the designer surface, or if you select "Load Default Items"
from component's designer context menu.
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