Mike Saltzman"]Set the MinValue and MaxValue on the column. 

Mike Saltzman"]I'm not sure what you mean. You would probably be better off asking this question in the ExporerBar forum.

Thanks Mike! With your help, I had solved the 2 questions above....=)

Mike Saltzman"]You can add an unbound column to the grid. But the data source will still have the same number of rows, rows are not specific to columns. You could just leave the cells in the other columns blank, of course, and even disable editing in those cells. 

you mean I have to do it in coding?

Another of my problem is.... I wish to have a "drop down images list" for one of the column in my UltraGrid, is it possible? I'd tried to set the column's Style to "Image" and assign an "Image List" to the UltraGrid but it doesn't seem to work.......

Okay, but that really doesn't answermy question. What do you want to store in the column? What do you want the cell to display?

 I'm having the same question

I want to show a table in the grid. One of the columns is an ID that links to another table with images. So basically I want to show the Image in the grid, with a dropdown to choose another image.

The dropdown with the images is working, but it won't show the image in the grid itself. It only displays 'System.Byte['

 Here's what I got so far (I simplified the code a bit, so it's possible it won't compile)

            DropDown = new UltraDropDown();
            DropDown.DataSource = dataTable;

            DropDown.DisplayMember = lookupColumnDefinition.DisplayColumnName;
            DropDown.ValueMember = lookupColumnDefinition.ValueColumnName;

            Column = dropDown.DisplayLayout.Bands["tableName"].Columns["ColumnContainingTheActualImage"];

            if (Column.DataType.ToString() == "System.Byte[")
            {
               Column.Editor = new Infragistics.Win.EmbeddableImageRenderer();
            }

           ultraGridColumn.ValueList = DropDown;

What event is this code in?

What are the actual data values you are using in your dropdown's ValueMember column? What data type are these values? 

What's the DataType of the column in the grid? 

 I'm doing this code in the form_load event.I set the entire layout of the grid there

 Let's assume I have the following situation, where I want to show tblCustomer in a grid, with the customer's photo

tblCustomer

CustomerId (int)
PictureId (int)

 tblPicture 

PictureId (int)
Photo (Image)

So the DisplayMember of the dropdown is  'Photo'
The ValueMember of the dropdown is 'PictureId'
The DataSource of the DropDown is set to tblPicture

 Ok, I figured it out. However, I just used a regular ValueList in stead of a BindableValueList

 For anyone who's interested in my code:

private void SetColumnImageLookupInternal(UltraGridColumn column, DataTable table, string dataValueColumnName, string dataTextColumnName, string dataPictureColumnName)
{
    ValueList ValueList;
    ValueListItem Item;

    ValueList = new ValueList();
    ValueList.DisplayStyle = ValueListDisplayStyle.DisplayTextAndPicture;

    foreach (DataRow Row in table.Rows)
    {
        Item = ValueList.ValueListItems.Add(Row[dataValueColumnName]);

        if (dataTextColumnName != null && Row[dataTextColumnName] != DBNull.Value)
        {
            Item.DisplayText = Row[dataTextColumnName].ToString();
        }

        if (Row[dataPictureColumnName] != DBNull.Value)
        {
            Item.Appearance.Image = ConvertToBitmap((byte[)Row[dataPictureColumnName]);
        }
    }

    column.EditorControl = null;
    column.Style = Infragistics.Win.UltraWinGrid.ColumnStyle.DropDownList;
    column.ValueList = ValueList;

}

 Thx Mike