The action that occurs when the tab is clicked. The default behavior is to switch the assigned page.

Supported modes are:

• "default" or empty
  The tab is selected and the TabPageClientId is activated
  
• javascript:SomeScriptCode();
  If the expression is prefixed with JavaScript this code is executed when the tab is selected. Note that you can call ActivateTab('divPage1') or ActivateTab(0) to select a Tab page.
  
• A URL
  You can specify a URL that moves the current browser instance to a new page. This can be useful for an exit link or for pages that share a common tab display across the top (for example in a user control).
  

o.ActionLink