Had an issue with webform_dopostbackwithoptions vs _ dopostback. webform_dopostbackwithoptions started showing up on a page and not showing up on other. Net pages. It was a pain my butt! Because webform_dopostbackwithoptions wasn't working, all my linkbutton had this JavaScript function rendered and none of the events were firing!
So after looking around I found out that I had some panels that were hidden on the page. and in one of those panels, I have a validation control, if a validation control is "hidden" on the page (the Panel's visibility is set to false and later made visible) then. net adds webform_dopostbackwithoptions to the button controls and thus does not work.
To fix this I had to change the linkbuttons that were not hidden to cause validation to false. (causevalidation = false). Once I did that, it work! What a pain in the butt!
Address: http://www.timmaxey.net/archive/2009/03/01/webform_dopostbackwithoptions-vs-__dopostback.aspx