'Remove an item from the internal ViewBox.'

def removeItem(self, item):

    if (not (item in self.items)):
        return
    self.items.remove(item)
    if (item in self.dataItems):
        self.dataItems.remove(item)
    if (item.scene() is not None):
        self.vb.removeItem(item)
    if (item in self.curves):
        self.curves.remove(item)
        self.updateDecimation()
        self.updateParamList()
