value of dynamic controls

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VB

ASP.NET

question for you, thats confusing me

I have a website ( asp.net / vb.net ) where a user has an option of 5 buttons to push. on click of the buttons , I use a 'ModalPopupExtender' to create a pop up containing options depending on which one is pressed. The pop up contains a placeholder which inturns contains dynamically created checkboxes, values coming from a database
the user then select the options they want and clicks save - on click i need to retreive the values of the check boxes

a quick example
2 buttons ( football, cricket )
click football, pop up appears with 4 check boxes ( dynamically created )
click cricket , pop up appears with 6 check boxes ( dynamically created )
users checks 2 boxes and clicks save
on save i need to retreive the vales of the checkboxes

issue
when i look at the placeholder.controls there is only 1 item
I've seen an example saying i should created the boxes on the page_load event, but at that stage I dont know what boxes Im creating

its driving me mad
any help / advice will be most appreciated


Regards
Matt