code: func (h *Hello) OnMenuClick() {
  	app.NewContextMenu(
  		app.MenuItem{
  			Label:   "Reload",
  			Keys:    "cmdorctrl+r",
  			OnClick: app.Reload},
  		app.MenuItem{Separator: true},
  		app.MenuItem{
  			Label: "Go to repository",
  			OnClick: func() {
  				app.Navigate("https://github.com/maxence-charriere/app")
  			}},
  		app.MenuItem{
  			Label: "Source code",
  			OnClick: func() {
  				app.Navigate("https://github.com/maxence-charriere/app/blob/master/demo/cmd/demo-wasm/hello.go")
  			}},
  	)
  }
docs: // OnMenuClick creates a context menu when the menu button is clicked.