In order not to have an access key you have to escape the "_" symbol in the RadButton's
content. The way to escape the underscore symbol is to put another one before it. In your case you need to put double "_" on every place you want a single underscore, because if you make only the first "_" double then the content will look like 'CT_SRVERROR_700' and "E" will be the short key.
Please give this approach a try and write us back if you have more questions.
the Telerik team