Add Trend Tag to existing/previous trend view [Citect Scada 2018 SA]

Hi,

The Default Info_Trend page, will upon click on the marked button show the tag in a new Process Analyst window. 

I would like to make similar button that will add the Equipment Trend tag to the existing/previous trend view that the user had open. 

Appreciate any suggestions how to assign such an button, what functions would I need to set up etc. ?

Thanks,

Rune