Trying to add onClick attribute to component

Hello, Fairly new to this great project but I am trying to change the display of a component onClick of another component after the component id is selected from the dropMenu. I'm having trouble trying to add an onClick attribute to the component after selection from a dropMenu trait. I can't seem to access the value of the dropMenu trait from within addAttributes(). I also can't use any variable from outside addAttributes() such as var comp = document.getElementById(this.get("traits").where({name: "dropMenu"})[0].get("value")) including editor.getSelected(). Thanks in advance editor.Componen...