Get dynamically created checkbox values but from onprerender stage

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C#

C#4.0

WebParts

SharePoint2010

HI,
I am trying to dynamically generate checkbox controls in web part (SP 2010) but the number of checkboxes that has to be created depends on the value from previous web part. Abiding by the web part communication infrastructure, I can get that value only on "onprerender" stage. But if I try to create checkboxes with that value count, I cannot get the selected values of the checkbox on postback! I am aware that dynamically created controls should be placed either in page_load or oninit. But, here am supposed not to put there since am getting the particular value in prerender stage. Please help! Am struck with this!