```
class MyMainWindow(VCPMainWindow):
    """Main window class for the VCP."""
    def __init__(self, *args, **kwargs):
        super(MyMainWindow, self).__init__(*args, **kwargs)

        self.coordOffsetGroup.buttonClicked.connect(self.offsetHandleKeys)
        self.toolButtonGroup.buttonClicked.connect(self.toolHandleKeys)
        self.toolBackSpace.clicked.connect(self.toolHandleBackSpace)
        self.mdiSmartButtonGroup.buttonClicked.connect(self.mdiSmartHandleKeys)
        self.mdiLoadParameters.clicked.connect(self.mdiSmartSetLabels)
        self.mdiSmartBackspace.clicked.connect(self.mdiSmartHandleBackSpace)
        self.gcodeHelpBtn.clicked.connect(self.tabForward)
        self.mdiBackBtn.clicked.connect(self.tabBack)