[bug] TabItem Events don't work (properly)

[tg--]

What happend?

Im trying to use Events on TabItems.
Since they don't support events directly, I'm using the Event() inside the Layout.
I've basically tried all possible events, but I can't get it to fire reliably at all.

As you may be able to see when running the attached example, the OnActivate event doesn't fire at all when a TabItem is activated.
However, if I Double Click on a TabItem it will fire exactly once.
To fire another time, another Event type has to be triggered first (see Tab 4).

I've also tried using a Custom() function and the EventHandler() and the behavior is the same.

Am I using it wrong, or is it broken?

giu version: v0.12.0
golang: 1.24.0

Code example

main.go

package main

import (
	g "github.com/AllenDang/giu"
)

func loop() {
	g.SingleWindow().Layout(
		g.TabBar().TabItems(
			g.TabItem("Tab 1").Layout(
				g.Event().OnActivate(func() { println("Tab1") }),
				g.Label("Test 1"),
			),
			g.TabItem("Tab 2").Layout(
				g.Event().OnActivate(func() { println("Tab2") }),
				g.Label("Test 2"),
			),
			g.TabItem("Tab 3").Layout(
				g.Event().OnActivate(func() { println("Tab3") }),
				g.Label("Test 3"),
			),
			g.TabItem("Tab 4").Layout(
				g.Event().OnDeactivate(func() { println("Tab4") }),
				g.Label("Test 4"),
			),
		),
	)
}

func main() {
	w := g.NewMasterWindow("Tab Test", 1000, 900, 0)
	w.Run(loop)
}

To Reproduce

1. Run my demo
2. Switch between tabs
3. Try double clicking on a tab
4. Switch between Tab 1-3 and 4 (other Event type).

Version

(latest, which?)

OS

Gentoo

[gucio321]

This(most likely) is because layout is built only when the tab is advice. Therefore, a similar mechanism to the TreeNodeWidget should be added (TabItem should have Event method to set EventHandler)