Python function doesn't work

[Noa_]

in my case "__CreateSubFunction" not work, so maybe i got a error think in this function, but i dont know.

PHP Code:

def __init__(self):
        ui.Window.__init__(self)
        self.Board = ui.BoardWithTitleBar()
        self.Board.SetSize(300, 500)
        self.Board.SetCenterPosition()
        self.Board.AddFlag('movable')
        self.Board.AddFlag('float')
        self.Board.SetTitleName("Test")
        self.Board.SetCloseEvent(self.Close)
        self.Board.Show()
        
        self.mainbutton = self.__SetButton(self.Board,50,100,"Base")
        self.mainbutton.Show()
        self.mainbutton.SetEvent(self.__CreateSubFunction)
    def __CreateSubFunction(self):
        res = self.__SetButton(self.mainbutton,10,10,"1")
        res.Show()
        return res

    def __SetButton(self,parent,x,y,text):
        button = ui.Button()
        button.SetParent(parent)
        button.SetPosition(x,y)
        button.SetUpVisual('d:/ymir work/ui/public/big_button_01.sub')
        button.SetOverVisual('d:/ymir work/ui/public/big_button_02.sub')
        button.SetDownVisual('d:/ymir work/ui/public/big_button_03.sub')
        button.SetText(text)
        return button 


cuz this func?

PHP Code:

 def __SetButton(self,parent,x,y,text):
        button = ui.Button()
        button.SetParent(parent)
        button.SetPosition(x,y)
        button.SetUpVisual('d:/ymir work/ui/public/big_button_01.sub')
        button.SetOverVisual('d:/ymir work/ui/public/big_button_02.sub')
        button.SetDownVisual('d:/ymir work/ui/public/big_button_03.sub')
        button.SetText(text)
        return button 


there a use button variable and twice is not allowed, maybe use it in list or dic

iam solved it, just button to self.button