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I am trying to add a window to me app, not a dialog. As I didn't find a way to do it straightforwardly, I thought of a possible solution: add a dialog, then turn it into a window. But when I do so, that window can't be initialized:

Traceback (most recent call last):
  File "/home/ilya/Projects/online-translator/online_translator/Indicator.py", line 184, in show_popup_window
    PopUpWindow = PopupDialog.PopupDialog()
  File "/home/ilya/Projects/online-translator/online_translator/PopupDialog.py", line 37, in __new__
AttributeError: 'Window' object has no attribute 'finish_initializing'

This is the code there:

class PopupDialog(Gtk.Window):
    __gtype_name__ = "PopupDialog"
    def __new__(cls):
        """Special static method that's automatically called by Python when 
        constructing a new instance of this class.

        Returns a fully instantiated PopupDialog object.
        builder = get_builder('PopupDialog')
        new_object = builder.get_object('popup_dialog')
        return new_object

    def finish_initializing(self, builder):
        """Called when we're finished initializing.

        finish_initalizing should be called after parsing the ui definition
        and creating a PopupDialog object with it in order to
        finish initializing the start of the new PopupDialog
        # Get a reference to the builder and set up the signals.
        self.builder = builder
        self.ui = builder.get_ui(self)

        Some other stuff...

I have a glade file named PopupDialog,ui with a popup_dialog window in it in my Project's folder.

What is wrong there? I really don't quiet understand, how that code works, because it is generated by Quickly automatically.

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