add_tab_and_ui.py

from PyQt4 import QtGui,QtCore
from PyQt4 import uic
#from PySide import QtGui,QtCore

def getMainWindow():
    "returns the main window"
    # using QtGui.qApp.activeWindow() isn't very reliable because if another
    # widget than the mainwindow is active (e.g. a dialog) the wrong widget is
    # returned
    toplevel = QtGui.qApp.topLevelWidgets()
    for i in toplevel:
        if i.metaObject().className() == "Gui::MainWindow":
            return i
    raise Exception("No main window found")

def getComboView(mw):
    dw=mw.findChildren(QtGui.QDockWidget)
    for i in dw:
        if str(i.objectName()) == "Combo View":
            return i.findChild(QtGui.QTabWidget)
    raise Exception("No tab widget found")

mw = getMainWindow()
tab = getComboView(getMainWindow())
tab2=QtGui.QDialog()
tab.addTab(tab2,"A Special Tab")
uic.loadUi("/home/danfalck/Documents/freecad/taskpanel_experiments/TaskPanelforTabs.ui",tab2)
tab2.show()

#tab.removeTab(2)