Alertdialog in Class python not Work

[bobwatcherx]

why does the alertdialog that I run on the python class look not working. there is something wrong with my code ?
or is there another way to run alertdialog on python class

from flet import *

class mainuser(UserControl):
	def __init__(self):
		super().__init__()
		self.dialogmain = AlertDialog(
			title=Text("!23"),
			content=Text("tolol")
			)
	def showdialog(self,e):
		self.dialog = self.dialogmain
		self.dialogmain.open = True
		self.update()

	def build(self):
		return Column([
			TextButton("show dialog",on_click=self.showdialog)

			])
		
def main(page:Page):
	page.update()
	mycar = mainuser()
	page.add(mycar)

flet.app(target=main)

[ndonkoHenri]

I made these changes and it works:

    def showdialog(self, e):
        self.page.dialog = self.dialogmain
        self.page.dialog.open = True
        self.page.update()    # update the page