Changes to .aspx page not showing on server

disclaimer - I am completely new to asp.net

I have an asp.net application (framework 1.1) running on a hosted server (I did not develop it).  I need to make a few minor modifications to some of the pages (.aspx), i.e. hide a button.  I opened the page in an editor (DreamWeaver) and added a Visible="False" for the button in question.  I then launched the app in IE and the button is still visible.  So after reading through quite a few posts here I decided to install IIS on my local machine and download the .NET 1.1 framework and the .NET SDK.  I copied the application folder from the server and placed in my local wwwroot folder.  I then performed the same modifation to the page on my local install (set button property Visible="False") and viewed the page in IE and the page displays correctly, i.e. the button is no longer visible.

Obviously I am missing something here.  I don't know why the change isn't effective on the production server but works on my local machine.  It is my understanding that the asp.net app is compiled the first time the app is called and that any changes I make to the source files should initiate a recompile - this is also what I've observed on the test app on my local machine.

I am looking for suggestions on where to start my troubleshooting process (remember my disclaimer).  Also, I am not using/don't have VS.NET.  I just received a copy of 'ASP.NET Unleashed' today and see that it includes on the CD a copy of Visual Web Developer Express but I have not installed it (yet?).  the changes I need to make, at least initially, to the app are strictly visual/layout/formating and I am under the impression that I CAN accomplish this with a basic editor (please correct me if I'm wrong).  What could be preventing my simple changes from working on the page(s) in question?  The pages load and function correctly but the button I have attempted to hide is still visible.

OM Gang