SSTab array to add as many tabs as you want?

[Elroy]

Here, I did it for you just like you wanted:

Option Explicit

Private Sub Command1_Click()
    Dim iPicLeft As Long
    Dim iPicTop As Long
    '
    ' We must save the top and left while the 0 tab is active.
    SSTabCtl.Tab = 0
    iPicLeft = Picture1(0).Left
    iPicTop = Picture1(0).Top
    '
    ' Now create the new tab and picturebox.
    SSTabCtl.Tabs = SSTabCtl.Tabs + 1
    SSTabCtl.Tab = SSTabCtl.Tabs - 1
    Load Picture1(SSTabCtl.Tabs - 1)
    Set Picture1(SSTabCtl.Tabs - 1).Container = SSTabCtl
    ' Now show on the current tab.
    Picture1(SSTabCtl.Tabs - 1).Left = iPicLeft
    Picture1(SSTabCtl.Tabs - 1).Top = iPicTop
    Picture1(SSTabCtl.Tabs - 1).Visible = True      ' New controls are always hidden.
End Sub

Project is attached.

Probably, the problem you were having is that your "master" picturebox wasn't just sitting on the form. It was already on the tab. When you change the active tab, you can no longer trust the .Left property of the picturebox on the first tab. And again, that's because the SSTab control isn't a series of containers. It's a single container that moves the controls around to create the illusion of multiple containers.