Object reference not set within an accordion control

[gg]

Hi,

I have a checkbox control inside an accordion.

During the page load I am attempting to set the Checked attribute as
follows...

If Session("bolShortDesc") = True Then
Me.chbxDescLength.Checked = True
Else
Me.chbxDescLength.Checked = False
End If

BTW I am doing this as I want it to maintain state across different
pages...

I am getting the NullReferenceException error "Object reference not
set to an instance of an object."

I figure this is because it is inside the accordion control?

This one must be simple but it is driving me nuts!

Thanks for your help