popup.kv

<CustButton@Button>:
    size_hint:None,None
    background_normal:''
    background_color:(0,0,0,0)
    BoxLayout:
        id:layout
        size_hint_y:None
        size: self.parent.size
        orientation:'vertical'
        padding:4
        pos: self.parent.pos

        
           

<cPopUp>:
    title:"Properties"
    size_hint:(0.3, 1)
    auto_dismiss:True
    pos_hint:{'right': 0.3, 'top': 1}
    BoxLayout:
        TabbedPanel:
            size_hint: 0.3,1
            pos_hint: {'top':1}
            do_default_tab: False
            tab_width: self.parent.width/3
            tab_height: 30

            TabbedPanelItem:
                text: 'Tab1'
                BoxLayout:
                    orientation: 'vertical'
                    GridLayout:
                        cols:2
                        size_hint_y:0.08
                        Label:
                            id:name_label
                            text:'NAME'
                            size_hint_y:None
                            height:25
                            valign:'middle'
                            font_size:14
                        TextInput:
                            id:name
                            size_hint_y:None
                            height:25
                            valign:'middle'
                            font_size:12
                            multiline:False
                    GridLayout:
                        size_hint_y: 0.8
                        cols:2
                        id:first_tab
                        spacing:10
                        padding:10,0
                    Button:
                        id:submit
                        size_hint_y:0.1
                        text:'Submit'

            TabbedPanelItem:
                text: 'Tab2'
            TabbedPanelItem:
                text: 'Tab3'