def setDtws(self):
#self.dtws = obj[0]
i = self.v.indexOf(self.mplWidget)
self.v.removeWidget(self.mplWidget)
self.mplWidget.deleteLater()
self.mplWidget = MSDtwCanvas(self.dtws, parent=self)
self.mplWidget.setMinimumSize(500,400)
self.v.insertWidget(i, self.mplWidget)
self.dtws=None
