add no_run annotation
@@ -81,7 +81,7 @@ impl MenuButton {
/// via the app scheme or by globally changin the draw function of
/// [`DownBox`](crate::enums::FrameType::DownBox):
///
-/// ```rust
+/// ```rust,no_run
///use fltk::{enums::*, prelude::*, *};
///
///fn my_down_box(x: i32, y: i32, w: i32, h: i32, col: Color) {
