Adding to a built in popup submenu

I wrote a little code to put the rgb "colorString" (as in modifygraph rgb=[colorString]) of a trace on the clipboard (in the same manner as right clicking a trace to put its full path on the clipboard, etc.). I had expected my submenu option to be in the "Copy" submenu, but it instead creates a second "Copy" submenu in the trace popup. Is there a way to put it in the built-in submenu? Thanks in advance!

Menu "TracePopup"
	Submenu "Copy"
		"ModifyGraph RGB(A)", /Q, traceColorToClip()
	end
End

Function traceColorToClip()
	GetLastUserMenuInfo
	String info = traceinfo(S_graphname,S_tracename,0)
	String easyInfo = "dummy~" + replacestring("RECREATION:",info,"|RECREATION~",1) + "|"
	String recreation = Stringbykey("RECREATION",easyInfo,"~","|",1)		//recreation is the last key, so put in a nonsense sepStr to get the entirety of the string from RECREATION: on
	String rgb = StringByKey("rgb(x)", recreation,"=")
	putscraptext rgb
End