Hi, 

BogdanW said:

a single click within cell causes it to become selected

This is what CellSelect mean for CellClickAction. If you want the cell to enter edit mode, then you need to Set CellClickAction to Edit.

BogdanW said:

a click on row selector does not select row.

The only reason I can think of for that is that you have turned off row selection in your grid. Maybe you are setting SelectTypeRow to None or else you are disabling the row or rows that you are clicking on.

BogdanW said:

a double click in a cell should select it ("paint blue")

For this you would have to handle the CellDoubleClick event and use PerformAction to take the cell out of edit mode and then select it in code.

        private void ultraGrid1_InitializeLayout(object sender, Infragistics.Win.UltraWinGrid.InitializeLayoutEventArgs e)
        {
            UltraGridLayout layout = e.Layout;
            UltraGridOverride ov = layout.Override;

            ov.CellClickAction = CellClickAction.Edit;
            ov.RowSelectors = DefaultableBoolean.True;
            ov.ActiveRowAppearance.Reset();
            ov.ActiveCellAppearance.Reset();
        }   

        private void ultraGrid1_DoubleClickCell(object sender, DoubleClickCellEventArgs e)
        {
            UltraGrid grid = (UltraGrid)sender;
            grid.PerformAction(UltraGridAction.ExitEditMode);
            e.Cell.Selected = true;
        }

Well ... your suggestion helped somehow, but this is still not what I want.

I just want "child band" behave like a typical spreadsheet, that is a click within row selector should 

cause row to be selected ("painted blue"), single click in a cell should edit it (but not select)

and a double click in a cell should select it ("paint blue").

What I get at this moment (after setting "CellClickAction" to "CellSelect" and implementing your

suggestions) is that a single click within cell causes it to become selected and a click on row selector

does not select row.