Hi

I have UltraCombo bound to data source. It has also one unbound column of checkbox type. Initially all rows are unchecked.

I discovered that when I click on this column's header check box the Value property changes step-by-step i.e. I have a series of ValueChanged events with 1st row checked then 1st and 2nd rows checked etc.

Problem is that after changing the value I have to hit database so when I try to check all rows it just stucks so I would like to have one query to database after check of uncheck all rows with one click.

I played with OnBeforeHeaderCheckBoxStateChanged method (using control inherited directly from UltraCombo) and here is sample code:

protected override void OnBeforeHeaderCheckBoxStateChanged(BeforeHeaderCheckStateChangedEventArgs e)
        {
            base.OnBeforeHeaderCheckBoxStateChanged(e);
            switch (e.NewCheckState)
            {
                case CheckState.Checked:
                    Value = Rows.Select(x => x.Cells[ValueMember].Value).ToList();
                    e.Cancel = true;
                    break;
                case CheckState.Unchecked:
                    Value = new List<object>();
                    e.Cancel = true;
                    break;
            }
        }

After doing this I almost got what I want but the problem is that the text in displaying part of combo is not being updated untill combo lost its focus even the rows are checked when I open dropdown again. Am I doing something wrong is there any way to do it better?

Thanks