Try to click on the controls in the Design part of the aspx page, not the HTML part.  I noticed that it ALWAYS works from the Designer but not always from the HTML.

Here is why http://blogs.msdn.com/mikhailarkhipov/archive/2007/01/23/how-does-split-view-work-in-vs-orcas.aspx

Thank you for the response.  The problem I have is that I am having to click on the control in the source view as I am using a master page with ajax tabs and accordion controls, so all I can see - in design mode - are the controls of the first tab page.  Maybe par5t of my answer is how to be able to see the controls within the second tab page..?

 Then I will be able to select the respective control in design mode.

Thank you.

Mark :)

With some care, I've been able to change the tabs by clicking on the tab itself in design mode.  Alternatively, you can change the tab index property in source view and save; it might update the view in design.

Aaaahhhhhhh!!! Thank Metal, this had been driving me nuts.  Turns out if once you put a control onto your page and then go into design view, the Events lightning bolt icon will then ALWAYS show up in design AND source view, but only for that control.  If you add a new control to you page, you must pop back into design view for a second to get the Events icon to show up for the new control.

You don't have to flip views. As I said - you simply need to sync design view (while staying in Source). Try using View | Sync Design View command