diff --git a/core/src/pipe.rs b/core/src/pipe.rs
index 2afb38da2..a14c5499d 100644
--- a/core/src/pipe.rs
+++ b/core/src/pipe.rs
@@ -476,9 +476,12 @@ macro_rules! multi_parent_impl {
             (p, child)
           },
           move |new_p, old_p, ctx| {
-            let arena = &ctx.tree.borrow().arena;
+            // Safety: we escape the borrow of arena, but we only access the children of the
+            // `old_p` and we know `compose_children` will not modifies the children of
+            // `old_p`.
+            let arena = unsafe { &(*ctx.tree.as_ptr()).arena };
             let children = old_p.children(arena).map(|id| Widget::from_id(id, ctx));
-            new_p.compose_children(children, ctx).consume()
+            new_p.compose_children(children.into_iter(), ctx).consume()
           },
         )
       } else {
diff --git a/dev-helper/src/widget_test.rs b/dev-helper/src/widget_test.rs
index 20c7fb689..99f70c624 100644
--- a/dev-helper/src/widget_test.rs
+++ b/dev-helper/src/widget_test.rs
@@ -90,7 +90,7 @@ macro_rules! widget_test_suit {
 /// use ribir_core::{ prelude::*, test_helper::* };
 /// use ribir_dev_helper::*;
 ///
-/// fn my_widget() -> Widget {
+/// fn my_widget() -> impl WidgetBuilder {
 ///   fn_widget!{
 ///     @MockBox {
 ///       size: Size::new(100., 100.),
@@ -98,16 +98,16 @@ macro_rules! widget_test_suit {
 ///         size: Size::new(50., 50.)
 ///       }
 ///     }
-///   }.into()
+///   }
 /// }
 ///
 /// // only use to avoid conflict.
-/// fn my_widget_a() -> Widget { my_widget() }
+/// fn my_widget_a() -> impl WidgetBuilder { my_widget() }
 ///
 /// // Only test the whole widget size.
 /// widget_layout_test!(my_widget_a, width == 100., height == 100.,);
 ///
-/// fn my_widget_b() -> Widget { my_widget() }
+/// fn my_widget_b() -> impl WidgetBuilder { my_widget() }
 /// // Only test the whole widget size but with a window size.
 /// widget_layout_test!(
 ///   my_widget_b,
@@ -116,7 +116,7 @@ macro_rules! widget_test_suit {
 ///   height == 10.,
 /// );
 ///
-/// fn my_widget_c() -> Widget { my_widget() }
+/// fn my_widget_c() -> impl WidgetBuilder { my_widget() }
 /// // Test two widget layout information.
 /// widget_layout_test!(
 ///   my_widget_c,
diff --git a/widgets/src/lists.rs b/widgets/src/lists.rs
index b578b1b27..69699dfdc 100644
--- a/widgets/src/lists.rs
+++ b/widgets/src/lists.rs
@@ -63,7 +63,7 @@ use ribir_core::prelude::*;
 ///           @Container {
 ///             size: Size::splat(40.),
 ///             background: Color::YELLOW,
-///           }.into()
+///           }.widget_build(ctx!())
 ///         )
 ///       }
 ///     }
@@ -96,7 +96,7 @@ use ribir_core::prelude::*;
 ///           @Container {
 ///             size: Size::splat(40.),
 ///             background: Color::YELLOW,
-///           }.into()
+///           }.widget_build(ctx!())
 ///         )
 ///       }
 ///     }