KeyBinding For Mouse(Any of them) dosn't trigger about gocui HOT 2 CLOSED

I try the Example of button

package main

import (
"fmt"
"log"

"github.com/jroimartin/gocui"
)

func main() {
g, err := gocui.NewGui(gocui.OutputNormal)
if err != nil {
log.Panicln(err)
}
defer g.Close()

g.Cursor = true
g.Mouse = true

g.SetManagerFunc(layout2)

if err := keybindings(g); err != nil {
log.Panicln(err)
}

if err := g.MainLoop(); err != nil && err != gocui.ErrQuit {
log.Panicln(err)
}
}

func layout2(g *gocui.Gui) error {
if v, err := g.SetView("but1", 2, 2, 22, 7); err != nil {
if err != gocui.ErrUnknownView {
return err
}
v.Highlight = true
v.SelBgColor = gocui.ColorGreen
v.SelFgColor = gocui.ColorBlack
fmt.Fprintln(v, "Button 1 - line 1")
fmt.Fprintln(v, "Button 1 - line 2")
fmt.Fprintln(v, "Button 1 - line 3")
fmt.Fprintln(v, "Button 1 - line 4")
}
if v, err := g.SetView("but2", 24, 2, 44, 4); err != nil {
if err != gocui.ErrUnknownView {
return err
}
v.Highlight = true
v.SelBgColor = gocui.ColorGreen
v.SelFgColor = gocui.ColorBlack
fmt.Fprintln(v, "Button 2 - line 1")
}
return nil
}

func keybindings(g *gocui.Gui) error {
if err := g.SetKeybinding("", gocui.KeyCtrlC, gocui.ModNone, quit2); err != nil {
return err
}
for _, n := range []string{"but1", "but2"} {
if err := g.SetKeybinding(n, gocui.MouseLeft, gocui.ModNone, showMsg); err != nil {
return err
}
}
if err := g.SetKeybinding("msg", gocui.MouseLeft, gocui.ModNone, delMsg); err != nil {
return err
}
return nil
}

func quit2(g *gocui.Gui, v *gocui.View) error {
return gocui.ErrQuit
}

func showMsg(g *gocui.Gui, v *gocui.View) error {
var l string
var err error

if _, err := g.SetCurrentView(v.Name()); err != nil {
return err
}

_, cy := v.Cursor()
if l, err = v.Line(cy); err != nil {
l = ""
}

maxX, maxY := g.Size()
if v, err := g.SetView("msg", maxX/2-10, maxY/2, maxX/2+10, maxY/2+2); err != nil {
if err != gocui.ErrUnknownView {
return err
}
fmt.Fprintln(v, l)
}
return nil
}

func delMsg(g *gocui.Gui, v *gocui.View) error {
if err := g.DeleteView("msg"); err != nil {
return err
}
return nil
}

But nothing occurs

from gocui.

With this i solved the case

from gocui.