How to know windows has opened?

[USTHzhanglu]

i want do some thing when app window opened, such as delete the windows menu by use winapi.
now i use iced::window::Event::Focused,but it`s seem not best.
may have a Event " iced::window::Event::WindowOpen(id)"?
or add a func like "fn run" to do something after windows opened？
this my code. if someone have a batter code ,please tell me. thinks

Message::Focused => {
    if cfg!(target_os = "windows") {
        let hwnd = unsafe {
            winapi::um::winuser::FindWindowA(
                std::ptr::null(),
                // "Window Class".as_ptr() as *const i8,
                "easyMCU".as_ptr() as *const i8,
                // std::ptr::null(),
            )
        };

        if hwnd == std::ptr::null_mut() {
            return;
        }
        println!("{:?}",hwnd);
        let hwmenu = unsafe { winapi::um::winuser::GetSystemMenu(hwnd, 0) };
        unsafe {
            winapi::um::winuser::RemoveMenu(
                hwmenu,
                winapi::um::winuser::SC_MAXIMIZE.try_into().unwrap(),
                winapi::um::winuser::MF_BYCOMMAND,
            )
        };
        unsafe { winapi::um::winuser::DrawMenuBar(hwnd) };
    };
    
    Command::none()
    }