AJAX ScriptManager problems on iPhone

Hi, i'm developing an asp.net web application for iphone and i'm using ajax.
I have no problems with the ajax behaviours (all the ajax controls like update panels are running correctly...).
But I have a problem with the ScriptManager itself: adding a ScriptManager on a page (in the runat server tag form), even if it is the only control in the page, touching the page on iphone it causes the entire form to be selected (I see the entire page highlited like a click on a big button).
It seems that every pixel of the page is an active control and the users can't understand which are the reals active controls (buttons, imagebuttons, links...).
Is there a way to avoid this behaviour?

Hope someone can help me!