Hi,

There's no UltraRadioButton control that I know of. I assume you are talking about UltraOptionSet.

So I tested this out with the following code:

            this.ultraOptionSet1.UseMnemonics = true;
            this.ultraOptionSet1.Items.Clear();
            this.ultraOptionSet1.Items.Add("Apple", "&Apple");
            this.ultraOptionSet1.Items.Add("Banana", "&Banana");
            this.ultraOptionSet1.Items.Add("Cherry", "&Cherry");

This seems to work fine for me... but the mnemonics do not display immediately when I run the application. They only display when I press the Alt key on my keyboard. This is default behavior in Windows Vista and I get the same behavior with any control, including the inbox button.

So if you are running Vista, perhaps that's why you are not seeing the mnemonics.