code: def emitCurrentChanged( self ):
          
          if ( not self.signalsBlocked() ):
              schema = self.currentSchema()
              self.currentSchemaChanged.emit(schema)
              if ( schema ):
                  self.currentTableChanged.emit(schema.model())
              else:
                  self.currentTableChanged.emit(None)
docs: Emits the current schema changed signal for this combobox, provided \
          the signals aren't blocked.