filling ui, stuck at removing center content dynamically

ui/ui_main.go

@@ -16,6 +16,8 @@ var (
 
 	accord     *widget.Accordion
 	center     *fyne.Container
+	devBtnList []*widget.Button
+	bacBtnList []*widget.Button
 )
 
 func Init(a fyne.App, w fyne.Window, c backive.Configuration, d backive.Database) {
@@ -28,7 +30,59 @@ func Init(a fyne.App, w fyne.Window, c backive.Configuration, d backive.Database
 
 func SetupLayout() {
 	accord = widget.NewAccordion()
+	devBtnList := []*widget.Button{}
+	devLayout := container.NewVBox()
+	for _, obj := range config.Devices {
+		btn := widget.NewButton(obj.Name, nil)
+		devBtnList = append(devBtnList, btn)
+		devLayout.Add(btn)
+	}
+	devices := widget.NewAccordionItem("Devices", devLayout)
+	accord.Append(devices)
+	bacBtnList := []*widget.Button{}
+	bacLayout := container.NewVBox()
+	for _, obj := range config.Backups {
+		btn := widget.NewButton(obj.Name, nil)
+		bacBtnList = append(bacBtnList, btn)
+		bacLayout.Add(btn)
+	}
+	backups := widget.NewAccordionItem("Backups", bacLayout)
+	accord.Append(backups)
 	center := container.NewMax()
-	content := container.New(layout.NewBorderLayout(nil, nil, accord, nil), accord, center)
+	left := container.NewMax()
+	left.Add(accord)
+	window.Resize(fyne.NewSize(800, 600))
+	content := container.New(layout.NewBorderLayout(nil, nil, left, nil), left, center)
 	window.SetContent(content)
+
+	// setup btns
+	for _, obj := range devBtnList {
+		obj.OnTapped = func() {
+			DisplayDevice(obj.Text)
+		}
+	}
+}
+
+func ClearCenter() {
+	if len(center.Objects) > 0 {
+		center.Objects = []fyne.CanvasObject{}
+	}
+}
+
+func DisplayDevice(dev string) {
+	ClearCenter()
+	vbox := container.NewVBox()
+	dataForm := container.New(layout.NewFormLayout())
+	vbox.Add(dataForm)
+	device := config.Devices[dev]
+	dataForm.Add(widget.NewLabel("Name"))
+	dataForm.Add(widget.NewLabel(device.Name))
+	dataForm.Add(widget.NewLabel("UUID"))
+	dataForm.Add(widget.NewLabel(device.UUID))
+	dataForm.Add(widget.NewLabel("Owner"))
+	dataForm.Add(widget.NewLabel(device.OwnerUser))
+}
+
+func DisplayBackup(bac string) {
+	ClearCenter()
 }