Selecting a Tab from a Tab List Button

I have a button with the following code:

<?xml version="1.0"?>
<button backcol="none" display="both" icon_size="large" label_pos="right" textcol="none" type="menu">
	<label>Tab List</label>
	<icon1>#foldertabs</icon1>
	<button backcol="none" display="label" field_type="label" size="full" textcol="none">
		<label>Left Lister</label>
		<icon1>#label</icon1>
		<function type="normal">
			<instruction>Set LABEL</instruction>
		</function>
	</button>
	<button backcol="none" display="both" icon_size="large" label_pos="right" textcol="none">
		<label>Tab List</label>
		<icon1>#foldertabs</icon1>
		<function type="normal">
			<instruction> Go TABLIST=keys,sortpath,maxwidth=700 OPENINLEFT</instruction>
		</function>
	</button>
	<button backcol="none" display="label" field_type="label" size="full" textcol="none">
		<label>Right Lister</label>
		<icon1>#label</icon1>
		<function type="normal">
			<instruction>Set LABEL</instruction>
		</function>
	</button>
	<button backcol="none" display="both" icon_size="large" label_pos="right" textcol="none">
		<label>Tab List</label>
		<icon1>#foldertabs</icon1>
		<function type="normal">
			<instruction> Go TABLIST=keys,sortpath,maxwidth=700 OPENINRIGHT</instruction>
		</function>
	</button>
</button>

Here is an example the results:

Clicking on any "inactive"/light gray tab moves to the pane for that tab. Except, if I try to move to the dark gray tab in the inactive pane nothing happens.

Feature suggestion: Allow for moving to the dark gray tab of the inactive pane.

Clearly, this is not a significant issue; just pointing it out for whatever value it might have for anyone.

The command doesn't change which side of the lister is active/source at all. It just brings tabs to the front.

Same is true whether those tabs are currently at the front or not. It doesn't activate that side of the lister in either case. If a tab is already at the front, clicking on it in the menu does nothing.

Maybe I've misunderstood?

Perhaps, I have either the concepts or the words garbled. So, let me tell you how I use some words and you can set me straight.

First, the word "multiple listers." As I understand it, this phrase means either multiple instances of DOpus, or dual listers in an instance or instances of DOpus. To get around this confusion for me, I use either "instances" for multiple instances of DOpus or "panes" for dual listers in a lister.

I have DOpus set up to always show two panes. I rarely use multiple instances.

Second, I have DOpus set up to use the Tab key to move between two panes. So, if I'm in the left pane where scrolling moves up and down the file list , the display border is a darker color. I think of this as the active or source pane. If I hit the Tab key, I am now in the right pane which is active or source pane.

Do I have these two points correct?

In the graphic above, I'm in the right pane. If I hit Right Lister 1, the "Active" tab is brought forward and the active/source pane remains the right pane. If I hit Left Lister 2, the "7z" tab is brought forward and the active/source pane - oops -ahh, as I walk through this right now - REMAINS on the right pane and that pane stays a dark color. Somehow, I thought it moved over to the left pane. Now, I see what you mean!