Hi, I have this piece of code

Rect mw;

public void Start()
{
    mw = new Rect(10, 10, 300, 300);
}

void func(int id)
{
    GUILayout.Button(new GUIContent("A", "B"));
}

public void OnGUI()
{
    mw = GUILayout.Window(10, mw, func, "aaa");
    GUI.Label(new Rect(330, Screen.height - Input.mousePosition.y, 300, 50), GUI.tooltip);
}

the logic is simple: display a window with a button and show a tooltip when the mouse hovers over the button. of course it doesn't work. what am I missing?

what happens: the window and the button inside it are displayed.

what doesn't happen: the tooltip is not shown when i hover over the button