property Item.Tab as Long
Specifies the identifier of the item/tab where the current group popup is shown instead.

TypeDescription
Long A Long expression that specifies the identifier of the item where the grouping items of the current item is shown.
By default, the Tab property is 0. The Tab property specifies the identifier of the item where the grouping items of the current item is shown. Use the Tab property to simulate Tab/Pages into your control. By default, the grouping items are displayed right/bottom after the item. The GroupPopup property specifies the way the grouping items are shown. Using the Tab property you can specify where the current grouping items/submenu is shown. Use the BackColor/HotBackColor properties to specify the background color/visual appearance for the grouping items. Use the BackColor/HotBackColor/SelBackColor/SelHotBackColor properties to specify the background color/visual appearance of a specified item

You can use the Tab property in combination with the following properties:

The following screen shot shows the Tabbed view feature with EBN files:

For instance, the following VB sample:

Dim context As New EXCONTEXTMENULib.ExContextMenu

Private Sub Form_Load()
    With context
        .Items.ToString = "[group=0x103]([group](Page 1[rad=1][group=3][spchk][tab=999][show=1](Info 1[chk=1],Info 2,Info 3),Page 2[rad][group=3][spchk][tab=999][show=1](Info 4,Info 5,Info 6)),[id=999])"
    End With
End Sub

Private Sub Form_MouseUp(Button As Integer, Shift As Integer, X As Single, Y As Single)
    context.Select
End Sub

generates the following screen shot: