Inside of the editor class I have the local variable CurrentfileName
and the function:
   def getTitle(self):
      return self.CurrentfileName

in the main code I have a function which parses each tabs elements for the one called editor, which is the editor object that belongs to that tab. After I have found editor I can simply call getTitle() and boom, the two are talking.

    def printChildren(self, obj, indent):
        children=obj.children()
        if children==None:
           return
        for child in children:
#debug           print indent, child.__class__
           if (child.__class__ == editor):
                self.setWindowTitle(child.getTitle()+" - PyTe v3")
#debug                print "editor"
#debug           self.printChildren(child, indent + "  ")