Private Sub elvVorschau_MouseDown(ByVal sender As Object, ByVal e As _
  System.Windows.Forms.MouseEventArgs) Handles elvVorschau.MouseDown
        If e.Button = Forms.MouseButtons.Left Then
            If _Vorschau.Items.Count < 1 Then Exit Sub
            Dim ItemX As UserControls.eListViewItem = _Vorschau.GetItemAt(e.X, _
              e.Y)
            If ItemX Is Nothing Then
                'Kein Item getroffen...
                CheckContextMenu.Show(elvVorschau, e.Location)
            Else
                'Item erwischt
                EditContextMenu.Show(elvVorschau, e.Location)
            End If
        End If
    End Sub