how to resizable native window size, after "decorations == false"(hide the title bar)

[peacess]

in the examples/custom_window_frame, hide the title bar and resizeable.

let options = eframe::NativeOptions {
viewport: egui::ViewportBuilder::default()
.with_decorations(false) // Hide the OS-specific "chrome" around the window
.with_resizable(true) // resizeable
..Default::default()
};

but can't resizable the native window,
how to do it.