Here the widget is allocated

def on_dialog_confirm(self, widget):
        """ Here the widget is allocated
        """
        variableName = str(self.dialog.get_field("name").get_value())
        if re.match('(^[a-zA-Z][a-zA-Z0-9_]*)|(^[_][a-zA-Z0-9_]+)', variableName) == None:
            self.errorDialog = gui.GenericDialog("Error", "Please type a valid variable name.", width=350,height=120)
            self.errorDialog.show(self.appInstance)
            return

        if variableName in self.varname_list:
            self.errorDialog = gui.GenericDialog("Error", "The typed variable name is already used. Please specify a new name.", width=350,height=150)
            self.errorDialog.show(self.appInstance)
            return

        param_annotation_dict = ''#self.widgetClass.__init__.__annotations__
        param_values = []
        param_for_constructor = []
        for index in range(0,len(self.widgetClass.__init__._constructor_types)):
            param = self.constructor_parameters_list[index]
            _typ = self.widgetClass.__init__._constructor_types[index]
            if _typ==int:
                param_for_constructor.append(self.dialog.get_field(param).get_value())
                param_values.append(int(self.dialog.get_field(param).get_value()))
            elif _typ==bool:
                param_for_constructor.append(self.dialog.get_field(param).get_value())
                param_values.append(bool(self.dialog.get_field(param).get_value()))
            else:#if _typ==str:
                param_for_constructor.append("""\'%s\'"""%self.dialog.get_field(param).get_value())
                param_values.append(self.dialog.get_field(param).get_value())
            #else:
            #    param_for_constructor.append("""%s"""%self.dialog.get_field(param).get_value())

        print(self.constructor_parameters_list)
        print(param_values)
        #constructor = '%s(%s)'%(self.widgetClass.__name__, ','.join(map(lambda v: str(v), param_values)))
        constructor = '(%s)'%(','.join(map(lambda v: str(v), param_for_constructor)))
        #here we create and decorate the widget
        widget = self.widgetClass(*param_values, **self.kwargs_to_widget)
        widget.attributes.update({'editor_constructor':constructor,
            'editor_varname':variableName,
            'editor_tag_type':'widget',
            'editor_newclass':'True' if self.dialog.get_field("editor_newclass").get_value() else 'False',
            'editor_baseclass':widget.__class__.__name__}) #__class__.__bases__[0].__name__
        #"this.style.cursor='default';this.style['left']=(event.screenX) + 'px'; this.style['top']=(event.screenY) + 'px'; event.preventDefault();return true;"
        #if not 'position' in widget.style:
        #    widget.style['position'] = 'absolute'
        #if not 'display' in widget.style:
        #    widget.style['display'] = 'block'

        for key in self.optional_style_dict:
            widget.style[key] = self.optional_style_dict[key]
        self.optional_style_dict = {}

        self.appInstance.add_widget_to_editor(widget)