Use button to go to another Glade GUI, using other Glade GUI, and then get the text of the second GUI entry box

Question

Good morning everyone, I'm in trouble with Glade. I managed with a button connect to the other glade graphical interface, but I can not get the text inside the entry box of the second GUI. I think have the handlers correct and the id's well defined. Can you tell me what is the problem ?

This are my GUI's

https://i.stack.imgur.com/CJZ35.jpg

I know by doing [var = builder.get_object("my_entry_id")][1], he is not getting anything. The error is giving me is:

Traceback (most recent call last): File "/home/pi/Downloads/schedule-0.4.3/testando.py", line 186, in apply state1 = text_state1.get_text() AttributeError: 'NoneType' object has no attribute 'get_text'

This is what i have:

def portManager(button):
   print ("Button Port Manager pressed")
   builder = Gtk.Builder()
   builder.add_from_file("Port_Manager.glade")
   handlers = {
           "action_Apply":apply
   }


   builder.connect_signals(handlers)
   window = builder.get_object("windowPort")
   window.show_all()

   Gtk.main()

def apply(button):
    text_state1 = builder.get_object("state1")
    state1 = text_state1.get_text()
    print(state1) 
    print ("Port Aplied!")




#-----------------------------------------------------------------------------------------------------------------------------------------------------

# GUI (Graphical User Interface)
builder = Gtk.Builder()                                                                                                                                  # Creates GUI
builder.add_from_file("Wi_Green_Sheddule_v1.glade")                                                                                                      # Gets GUI   
handlers = {                                                                                                                                             # Associates GUI to functions Python                  
      "action_clear": clear,                                                                                                                             # Action of Button Clear defined      
      "action_start": action_start,                                                                                                                      # Action of Button Start defined   
      "save_hours": save_hours,                                                                                                                          # Action of Button Save defined      
      "delete_file": delete_file,                                                                                                                         # Action of Button Delete defined
      "portManager": portManager
   }

builder.connect_signals(handlers)                                                                                                                        # Connects GUI handlers to functions
window = builder.get_object("window")                                                                                                                    # Gets the inside of GUI         
window.show_all()                                                       

Gtk.main()
#-----------------------------------------------------------------------------------------------------------------------------------------------------