I've never used the datafilter before, works great.

Implementation was a breeze thanks to your sample!

Indeed, I'd like to display both false and dbnull as unchecked.

I'll have a look at the datafilter. The grid is only used to display the values, no editting allowed.

Hi, found this (old) post through Google.

Using infragistics 15.1, I'm having the same issue and am unable to work out a solution: There are multiple columns defined as Boolean? but the grid should display a checked or an unchecked checkbox, not tristate. Setting a default value on our generic datasource is not desirable.

In the initializelayout event of the grid, I tried forcing the style of all the affected columns to UltraWinGrid.ColumnStyle.CheckBox. No success.

I see that column.IsNullable is True, if I change column.Nullable to UltraWinGrid.Nullable.Disallow the value becomes false. However, the visual outcome remains the same.

Any suggestions?