Leaving the property empty serves the same purpose as "auto". If you have a width set off the control itself then the columns will stretch to the size of its data and create a scrollbar if needed. Otherwise the grid will be as large as the data is.

Can you use DefaultColumnWidth to make the column auto fit its contents?  I tried using "auto" but it wouldn't accept it.

Ok, we added a property in 9.2 called DefaultColumnWidth. This property is avaiable off of the grid itself. You can set the column width here and all the column will default to that width. If the total column widths is greater than the grid width then a horizontal scrollbar will appear.

Hope this helps.

-Taz.

Yeah, I am setting the individual columns.  We're in the process of upgrading to 2009.2 we have to fix some minor bugs as a result of the upgrade, but in 2009.1 I used the following code to set the column widths

private void AutoSetColumnWidths() 
{
            if (_dataSet == null || _dataSet.Tables[0] == null) return;

            foreach (DataColumn column in _dataSet.Tables[0].Columns)
            {
                BoundDataField field = new BoundDataField();
                field.Key = column.ColumnName;
                field.Header.Text = column.ColumnName;
                field.Width = 100;
                flatGrid.Columns.Add(field);

                var setting = new ColumnResizeSetting();
                setting.ColumnKey = column.ColumnName;
                setting.EnableResize = true;
                setting.MinimumWidth = 50;
                setting.MaximumWidth = 150;
                flatGrid.Behaviors.ColumnResizing.ColumnSettings.Add(setting);
            }
        }

 The horizontal scrollbar is still not appearing.  Any ideas?