Mimicing the tabbed table function
The problem with the Notes tabbed table is that you can not, by default, add an action when you click on a tab.
I created a tabbed table function in the way you probably would do it on the web (with hidding/showing divs) so a tab is just a table column with a text hotspot in it. When you click on the text a different table would be shown with an ‘active tab’ highlighted:

The reason for this solution is that the form is presented in a dialogbox and I have to set a parameter from which tab the user has selected a document-template (templates may be stored in different databases).
So how to fix this with a Notes tabbed table outlook?
First create images for all active tabs:
& 
Then sharpen your eyes (or use good photo-editor program) and select a part of the horizontal row/border that aligns the table to the width of the page (correctly described?):
This is an enlarged example:

Now place your tabbed images in separate tables, give the table a background color and a cell image of the ‘zoomed’ example:

On your ‘tabbed’ images you place hotspot rectangles that will do the hide/when-work. Here you can write now also the action that is not possible for a normal ‘tabbed table’:

At the end the result will look something like this:

One other point you forgot to mention: in the image resource properties set the “images across” to 2. Otherwise it tries to show both images simultaneously.
I’ve been doing this in an app recently, too, but I took it a step further. I copied out the highlighted tab image and saved that all by itself. Then in the Hotspot I hide the two-image version and show the single image. The end result is the tab stays highlighted when clicked, which is what the users expect. If you have a different technique for selecting which of the two image are displayed in the table I’d be interested in hearing it. I’d love to not need two images for every tab.