HOW-TO: create "right-click" menu

[Kevin C. <kev...@ho...>]

I am wanting to implement the "right-click" feature on the cpuplot widget 
example in qwt.

Does anyone know any example code of creating the "right-click" menu 
functionality of a widget. Do all widgets inherit this "right-click" menu 
functionality? Are they called context menus?

Can you create this "right-click" context menu in QT Designer?