title: Qt: How to detect the right clicked item when using customContextMenuRequested signal
body: <p>hello all 
  quick question 
  im using in Treewidget the customContextMenuRequested signal and using using popup with qmenu 
  How can I get the item pointer / object / reference that just bean right clicked before the popup executed<br>
  I need to make some validation on the item  </p>