title: Add ActiveFilterString clause to DevExpress GridView CustomFilterRow
body: <p>I have DevExpress <code>GridView</code> where I have a datatable as datasource. Now I have a hidden column which is used to filter the view using <code>CustomFilterRow</code> event. Now the problem is when  the user puts in any filter it is ignored as <code>e.Handled</code> in the <code>CustomFilterRow</code> event is set to <code>True</code>. What I want is to also filter the view using the user's filter string keeping my filter active, i.e. no matter whatever the filter the user provides it will always add on the filter algorithm I've provided originally in the <code>CustomFilterRow</code> event.</p>
  
  <pre><code>Private Sub GridView_Dept_CustomRowFilter(ByVal sender As Object, ByVal e As DevExpress.XtraGrid.Views.Base.RowFilterEventArgs) Handles GridView_Dept.CustomRowFilter
      If IsLoadComplete = False Then
          Exit Sub
      End If
      Dim view As GridView = CType(sender, GridView)
      Dim dv As DataView = view.DataSource
      If Not IsEqual(dv(e.ListSourceRow).Item("EXUSER"), Me.GridViewUser.GetFocusedRowCellValue("EXUSER")) Then
          e.Visible = False
          e.Handled = True
      End If
  End Sub
  </code></pre>
  
  <p>DevExpress - 9.2 .Net - 2.0 VS - 2008</p>
  
  <p>P.S. - I'm not allowed to upgrade to higher versions because of company policy.</p>