Delete Style in RPE1.3

RPE 1.3 Question:    

I have a master template that dynamically imports other templates. I created a style in the 2nd template and  now have a duplicate style with the first.  This causes the  Launcher to error and stop. How can I delete the style in the 2nd imported template. Right clicking on the style shows the DELETE greyed out? My work around is to rename the second style to avoid the duplication.

Any help is appreciated.