I am trying to build an application based on the following usage example (How to create a tree view with checkboxes in Python).
This example builds a Treeview with checkboxes using the Tix library. However, when I run this example, whenever a Checkbox is checked, the text label of that box disappears. 
Could someone help me to avoid the behaviour mentioned just above?
import Tix
class View(object):
    def __init__(self, root):
        self.root = root
        self.makeCheckList()
    def makeCheckList(self):
        self.cl = Tix.CheckList(self.root, browsecmd=self.selectItem)
        self.cl.pack()
        self.cl.hlist.add("CL1", text="checklist1")
        self.cl.hlist.add("CL1.Item1", text="subitem1")
        self.cl.hlist.add("CL2", text="checklist2")
        self.cl.hlist.add("CL2.Item1", text="subitem1")
        self.cl.setstatus("CL2", "on")
        self.cl.setstatus("CL2.Item1", "on")
        self.cl.setstatus("CL1", "off")
        self.cl.setstatus("CL1.Item1", "off")
        self.cl.autosetmode()
    def selectItem(self, item):
        print item, self.cl.getstatus(item)
def main():
    root = Tix.Tk()
    view = View(root)
    root.update()
    root.mainloop()
if __name__ == '__main__':
    main()