kivy popup with 2 buttons

gistfile1.txt

I created a popup in kivy with two buttons...
one button closes the popup while the other does nothing..
I used the floatlayout ..

this is the. py file...

#-*-coding:utf8;-*-
#qpy:2
#qpy:kivy

from kivy.app import App
from kivy.uix.popup import Popup 
from kivy.uix.widget import Widget
from kivy.uix.label import Label
from kivy.uix.button import Button 
from kivy.uix.floatlayout import FloatLayout 
from kivy.lang import Builder 


Builder.load_file("pop.kv")


class pop(Widget):
    def show_it(self):
        self.box=FloatLayout()
        
        self.lab=(Label(text="this is a pop exampleby vitriol ",font_size=15,
        	size_hint=(None,None),pos_hint={'x':.25,'y':.6}))
        self.box.add_widget(self.lab)
        
        self.but=(Button(text="close",size_hint=(None,None),
        	width=200,height=50,pos_hint={'x':0,'y':0}))
        self.box.add_widget(self.but)
        
        self.box.add_widget(Button(text="blank",size_hint=(None,None),
        	width=200,height=50,pos_hint={'x':.5,'y':0}))
       
        self.main_pop = Popup(title="my_pop",content=self.box,
        	size_hint=(None,None),size=(450,300),auto_dismiss=False,title_size=15)
        	
        self.but.bind(on_press=self.main_pop.dismiss)
        
        self.main_pop.open()
        


class PopApp(App):
    def build(self):
        return pop()




PopApp().run()



and the kv file...

## kivy for my_popup...

<pop>:
    Button:			
	    id: main_button
	    text: "pop-up"
	    font_size: 25
	    size_hint: None,None
	    width:root.width/2
	    height:60
	    on_press: root.show_it()