class MainWindow(QtGui.QMainWindow):
    def __init__(self):
        # ...
        # Creating tabs and using tab widget as a Central widget
        
        self.tabs = QtGui.QTabWidget()
        self.tabs.TabShape(QtGui.QTabWidget.Rounded)
        self.tabs.addTab(self.basicMode(), "Basic") # index = 0
        self.tabs.addTab(self.bulbMode(), "Bulb") # index = 1
        self.tabs.addTab(self.timedMode(), "Timed") # index = 2
        self.tabs.addTab(self.viewerMode(), "Viewer") # index = 3
        self.tabs.addTab(self.systemMode(), "System") # index = 4
        
        self.setCentralWidget(self.tabs)
        #...
        self.tabVisibility()
        #...
 
    def tabVisibility(self):
        count = self.tabs.count() # Number of tabs, used for failsafe!
        if USEFULLSCREEN != True and count == 5: # Removing systemMode if not fullscreen
            self.tabs.removeTab(count-1)
        
        if CURRENT_REMOTETYPE == "Olympus_RM-1" and USEFULLSCREEN == True and count < 5: # Includes Viewer tab, only if it is not there!
            self.tabs.removeTab((count-1))
            self.tabs.addTab(self.viewerMode(), "Viewer")
            self.tabs.addTab(self.systemMode(), "System")
        
        elif CURRENT_REMOTETYPE == "Olympus_RM-1" and USEFULLSCREEN != True and count == 3: # Includes Viewer tab, only if it is not there!
            self.tabs.addTab(self.viewerMode(), "Viewer")
        
        elif CURRENT_REMOTETYPE != "Olympus_RM-1" and count == 5:
            self.tabs.removeTab(3)
    
    def settingsDialog(self):
        #...
        
    def setSettings(self):
        #...
        self.tabVisibility() # Handling visibility of tabs
        settings.sync()
        self.dialog.accept()