I am not sure what exactly you mean by "the cancel button is not showing properly"
but I assume that you mean that the cancel button is shown as a link button in most of the skins. We recently changed this and made it by design but it turned out that our customers prefer the old way it was shown as a button and thus we reverted the design in the last release which is Q3 2009 SP1. This being said, in case you are not using this build, please upgrade to it and test again.
In case this is the build you are using or this is not what you mean, please provide a screenshot of the incorrect display and your custom CSS related to radconfirm if you have such and we will do our best to help.
All the best,
the Telerik team