[Plugin: Sliding Panel] Tabbing within psliding panel

Hi,
I can tab to the open/close button, so that i can open the panel using my keyboard.
However, Once open I’d like to be able to tab through all the links etc within the panel, does anyone know how I can achieve this? I can currently tab through the contents of the sliding panelafter tabbing through the rest of the webpage. I would like it to be first.

any help would be much appreciated.

thanks

https://www.ads-software.com/extend/plugins/sliding-panel/