Asp.Net Menu control

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C#3.0

C#

Hi
I have used the asp.net menu control in a user control.I have included the user control in a master page,which has event handler for firing the menu item click event.I will be disable and enable the menu items based on need.When After disabling the menu item if click a enabled Menu item i get the following error

"Can't select a disabled or unselectable menu item"

But if I load the menu after clearing the menu item every time befor enabling or disbaling the menuitems ,above mentioned error is not generated

Thanks in advance