Hello,

When the HeaderCheckBoxSynchronization is set to Band or RowsCollection, the Cell values and header checkbox will always be kept synchronized. Therefore, changing the value of one of the affected cells, will change its header checkbox.

To achieve the desired results, you'll have to handle the synchronization yourself.

First you'll have to change the CheckBoxSynchronization of the appropriate column to HeaderCheckBoxSynchronization.None.

Me.grd.DisplayLayout.Bands(0).Columns(0).Header.CheckBoxSynchronization = HeaderCheckBoxSynchronization.None

Now you'll need to make sure the values of the cells are changed whenever the checkbox is clicked. This can be done by handling the AfterHeaderCheckStateChanged event, and setting the value for each row in e.Rows.

    Private Sub grd_AfterHeaderCheckStateChanged(ByVal sender As System.Object, ByVal e As Infragistics.Win.UltraWinGrid.AfterHeaderCheckStateChangedEventArgs) Handles grd.AfterHeaderCheckStateChanged
        Dim column As UltraGridColumn = e.Column
        Dim rows As RowsCollection = e.Rows
        Dim checkStateValue = column.GetHeaderCheckedState(rows)
        For Each row In rows
            row.Cells(column).Value = checkStateValue
        Next
    End Sub

This should help you achieve your desired functionality. Let me know if I can be of further assistance.

Thanks,

Chris