View State issues inside data grid

When we have a checkbox or a drop down list inside item template column of data grid, it is not maintaining View State? Do we need to do anything special for this purpose ? Right now what we are doing is this: We have the gird which is bound to data on clicking of button1. In the grid we have one checkbox column and when I select few checkboxes and click Button2 (which is meant to open another section in the page with these records), the checkbox disappears from the grid. I tried with EnableViewState as true also, but that also does not work. Do we need to do anything else for this? Thanks Ashish

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