>I feel like I should be able to solve this one, but I've been failing miserably for some time now, so if this problem is due to a temporary suspension of lateral thought, my apologies!
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>I am trying to set up a grid that selectively displays records from a table (they are order lines). Along-side the information from the table, I want another column that contains a checkbox, so that the user can select which records they want to include.
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>The problem seems to stem from the fact that there is no field in the table to represent this extra "Include Record" field. Can anyone suggest how I could go about this?

There is no way you can know which selected data represented by a checkbox without a field bounded into it. What we are doing is that, we created extra field for that matter. Another way is using Listbox with MultiSelect property set to .T. for multiple selection instead of Grid.