Image TemplateColumn DataGrid Viewstate

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I have a Datagrid with several TemplateColumns. I am creating ALL (BoundColumn & TemplateColumn) of the columns for the DataGrid during the PAGE_INIT. One TemplateColumn is a checkbox that allows the user to select the row/datagriditem to carry forward in a wizard. The other TemplateColumns contain a System.Web.UI.WebControls.Image. In the ITEMCREATED event for the datagrid, I toggle the ImageURL property for each Image based on certain parameters. My problem is getting the property changes I make to each Image to carry forward on subsequent postbacks. Initially I had the problem with the checkbox until I realized I was naming it in my ItemCreated event. On postbacks after the ITEMCREATED event if fired, the Images default back to the properties I assigned to them when they were created

Is there a limitation on what is kept in the Viewstate for a System.Web.UI.WebControls.Image? Perhaps someone knows of a classic pitfall that would keep this from happening? Is there a better event in which to create the columns for my datagrid other than the PAGE_INIT

Thanks in advance