Hi Dan,
You have 3 columns with explicit widths, but if the RadGrid control is wider than the sum of all column widths, the columns will expand. Generally, it is good to leave one column (e.g. the last one) with no width, so that it can adjust, according to the RadGrid width.
In addition, column width should be set with HeaderStyle-Width, not ItemStyle-Width.
Regards,
Dimo
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