entry := widget.NewEntry()
entry.SetText("this is an entry")
entry.Resize(fyne.Size{Width: 400, Height: 100})
button := widget.NewButton("button", func() {})
button.Resize(fyne.Size{Width: 200, Height: 100})
hbox := container.NewHBox(entry, button)

items := []string{"A", "B", "C", "D", "E"}
list := widget.NewList(
	func() int {
		return len(items)
	},
	func() fyne.CanvasObject {
		box := container.NewHBox(widget.NewLabel("Template Object"))
		return box
	},
	func(id widget.ListItemID, item fyne.CanvasObject) {
		box := item.(*fyne.Container)
		label := box.Objects[0].(*widget.Label)
		label.SetText(items[id])
	})

list.Resize(fyne.Size{Width: 800, Height: 500})
vbox := container.NewVBox(
	hbox,
	list,
)

myWindow.SetContent(vbox)
myWindow.ShowAndRun()