This is a very very small mod.
I got tired of having to move the mouse far away from the merchant window to open all my bags when I had to sell items, therefore this small mod, it adds a shortcut to merchantwindow allowing you to left click to toggle opening/closing all bags. It also adds the open all bags toggle-button to the bankerwindow.

To install into a custom UI:

1. Unzip the file and put it into your C:\Program Files\Sony\Vanguard\VGUIAssets\Shells\<your UI>\windows folder

2. Open the index.xml file found in your custom UI folder

3. Add the line --> <Window filename="merchantlist.xml"/> at the bottom of the file above where it says -->
</GameplayWindows>
</XML>

4. It will now looks like this -->
<Window filename="merchantlist.xml"/>
</GameplayWindows>
</XML>

5. Save the file and you are done