How to refresh the FolderListModel on click of mouse area of reactangle in qml ?

[Qt embedded developer]

i have seen that when we open qml at that time my detected folder on usb i can see on qml .

but on same qml based ui when remove pen drive then that does not get shown on qml .

So what is right solution to show folder model list on connect and disconnect on pen drive based folder's view on qml ?

i have used FolderListModel to show file on qml .