Hi Sreekanth Medisetty,
Currently, there is no way to remove the alert icon from the Alert control template. We are working on improving the styling of our modal dialogs and soon we have to introduce a better mechanism for editing their style.
Which Demo have you tried to implement that doesn't seem to work? I guess everything from our online example is currently running without any problems. And what do you mean to implement RadWindow as a MessageBox, do you refer to the asynchronous calls?
Thank you for your collaboration and we look forward to hearing from you soon.
the Telerik team