ButtonColumn postback problem

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I have a button column in a datagrid. When a button is clicked on I want it to use it's value as a variable a new SQL query that will repopulate the datagrid

The problem is that the DataGrid.ItemCommand method only seems to fire if the datagrid is rebound in the page_load method. Apart from being inefficient it also causes duplicate columns in my datagrid

Can anyone tell me where I'm going wrong here

Thanks in advance, John.