How to show Context menu in Desktop QML

Hi, I am following Christophe Dumez(“http://cdumez.blogspot.in/2010/11/how-to-use-c-list-model-in-qml.html”) in my application. Now i want to display context menu in my QML. And item in context menu will be condition based e.g. if i click left button then there is only one item(“One Item”) & if i click right button then there will be two items(“One Item “, Two Item). So can you please suggest me how to make context menu in my QML.(Provide me any example link)