Description: As the tree using xml data source to achieve the right menu function, insert the tree, delete, modify
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File list (Check if you may need any files):
treeviewdemotree
................\bj1.jpg
................\dragwidget.cpp
................\dragwidget.h
................\frank.xbel
................\house.png
................\lamp.png
................\main.cpp
................\mainwindow.cpp
................\mainwindow.h
................\mainwindow.ui
................\qcustlabel.cpp
................\qcustlabel.h
................\res.qrc
................\test.m
................\treeview.pro
................\treeview.pro.user
................\xbeltree.cpp
................\xbeltree.h