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Me.gridDataBoundGrid1.Binder.EnableEdit = false
or
Me.gridDataBoundGrid1.TableStyle.ReadOnly = true
at the bottom of FormLoad, I do not see an empty filter row.
How are you setting your readonly property? Are you setting it before you wire the filterbar? If so, you might try calling grid.IgnoreReadOnly = true before you wire the filterbar, and then set it back false afterwards.