Tappable Circle does not appear but is tappable

main.go

package main

import (
	"image/color"

	"fyne.io/fyne/v2"
	"fyne.io/fyne/v2/app"
	"fyne.io/fyne/v2/canvas"

	fatih "github.com/fatih/color"
)

type TapLabel struct {
	*canvas.Circle

	OnTapped func() `json:"-"`
}

func (mc *TapLabel) Tapped(*fyne.PointEvent) {
	if mc.OnTapped != nil {
		mc.OnTapped()
	}
}

func newTabCircle(color color.Color, tapped func()) *TapLabel {
	return &TapLabel{
		canvas.NewCircle(color),
		tapped,
	}
}

func main() {
	myApp := app.New()
	myWindow := myApp.NewWindow("Tappable circle")
	myWindow.Resize(fyne.NewSize(600, 600))

	myWindow.SetContent(newTabCircle(color.White, send))
	myWindow.ShowAndRun()
}

func send() {
	fatih.Cyan("this\n")
}