Hi,

Okay, I see the problem now. I think what's happening here is that the DoubleClick event is firing on the second MouseDown. But then the final MouseUp is going to re-select the row that the mouse is on.

So the sequence of events for the Double-Click goes like this:

MouseDown

MouseUp

MouseDown

DoubleCilck event fires and row 0 in the grid is selected.

MouseUp - causes the row the mouse is over to be selected.

To verify this, I used the same code you have here posted here. So in the DoubleClickRow event, I cleared the datasource rows, and then did this:

                this.grdData.Rows[0].Activate();
                this.grdData.Rows[0].Selected = true;
                this.grdData.Selected.Rows.Clear();

Then I put some Debug.Writeline statement into the AfterSelectChange event so I can see what's getting selected.

When I run the app and DoubleClick on a row 2 in my grid, I see this:

Selected Row: 0

No rows selected

Selected Row: 2

So the code is selecting row 0, then clearing the selection, and then row 2 (which the mouse is over) gets selected after all of that is done.

So... the solution is pretty simple. You just have to create a delay so that your code which selects the first row happens after the event and the MouseUp have already completed. You can do that by using a BeginInvoke.

So the code will look something like this:

        private void ultraGrid1_DoubleClickRow(object sender, Infragistics.Win.UltraWinGrid.DoubleClickRowEventArgs e)
        {
            this.dsData.Rows.Clear();

                for (int i = 0; i < 10; i++)
                {
                    UltraDataRow rootRow = this.dsData.Rows.Add();
                    rootRow["Column 0"] = "1";
                    rootRow["Column 1"] = "1";
                }

                this.BeginInvoke(new MethodInvoker(this.SelectFirstGridRow));
        }

        private void SelectFirstGridRow()
        {
            this.ultraGrid1.Rows[0].Activate();
            this.ultraGrid1.Selected.Rows.Clear();
            this.ultraGrid1.Rows[0].Selected = true;
        }