// Create a PanelHolder with a 3 panels
func panelHolder(name string, theme gxui.Theme) gxui.PanelHolder {
label := func(text string) gxui.Label {
label := theme.CreateLabel()
label.SetText(text)
return label
}
holder := theme.CreatePanelHolder()
holder.AddPanel(label(name+" 0 content"), name+" 0 panel")
holder.AddPanel(label(name+" 1 content"), name+" 1 panel")
holder.AddPanel(label(name+" 2 content"), name+" 2 panel")
return holder
}