diff --git a/emigui/src/containers/collapsing_header.rs b/emigui/src/containers/collapsing_header.rs
index 5c7c49a8..91eb8914 100644
--- a/emigui/src/containers/collapsing_header.rs
+++ b/emigui/src/containers/collapsing_header.rs
@@ -120,9 +120,11 @@ impl CollapsingHeader {
 
                 let top_left = child_region.top_left();
                 add_contents(child_region);
-                // Pretend children took up less space than they did:
-                child_region.child_bounds.max.y =
-                    child_region.child_bounds.max.y.min(top_left.y + max_height);
+
+                // Pretend children took up less space:
+                let mut child_bounds = child_region.child_bounds();
+                child_bounds.max.y = child_bounds.max.y.min(top_left.y + max_height);
+                child_region.force_set_child_bounds(child_bounds);
             });
         } else if state.open {
             region.indent(id, add_contents);
diff --git a/emigui/src/containers/frame.rs b/emigui/src/containers/frame.rs
index 19ed27b3..e4353f7b 100644
--- a/emigui/src/containers/frame.rs
+++ b/emigui/src/containers/frame.rs
@@ -35,9 +35,7 @@ impl Frame {
             },
         );
 
-        // TODO: move up corsor?
-        region
-            .child_bounds
-            .extend_with(child_region.child_bounds.max + margin);
+        region.expand_to_include_child(child_region.rect().expand2(margin));
+        // TODO: move up cursor?
     }
 }
diff --git a/emigui/src/math.rs b/emigui/src/math.rs
index 468c8784..5ea03ce7 100644
--- a/emigui/src/math.rs
+++ b/emigui/src/math.rs
@@ -358,12 +358,18 @@ impl Rect {
         }
     }
 
-    /// Expand by this much in each direction
+    /// Expand by this much in each direction, keeping the center
     #[must_use]
     pub fn expand(self, amnt: f32) -> Self {
         Rect::from_center_size(self.center(), self.size() + 2.0 * vec2(amnt, amnt))
     }
 
+    /// Expand by this much in each direction, keeping the center
+    #[must_use]
+    pub fn expand2(self, amnt: Vec2) -> Self {
+        Rect::from_center_size(self.center(), self.size() + 2.0 * amnt)
+    }
+
     #[must_use]
     pub fn translate(self, amnt: Vec2) -> Self {
         Rect::from_min_size(self.min + amnt, self.size())
diff --git a/emigui/src/region.rs b/emigui/src/region.rs
index d4df06fc..45c541b2 100644
--- a/emigui/src/region.rs
+++ b/emigui/src/region.rs
@@ -30,9 +30,10 @@ pub struct Region {
     /// but may overflow (which you will see in child_bounds).
     desired_rect: Rect, // TODO: rename?
 
-    /// Bounding box of children.
-    // TODO: remove pub(crate)
-    pub(crate) child_bounds: Rect,
+    /// Bounding box of all children.
+    /// This is used to see how large a region actually
+    /// needs to be after all children has been added.
+    child_bounds: Rect,
 
     /// Overide default style in this region
     style: Style,
@@ -188,6 +189,21 @@ impl Region {
         self.child_bounds.max - self.desired_rect.min
     }
 
+    /// Expand the bounding rect of this region to include a child at the given rect.
+    pub fn expand_to_include_child(&mut self, rect: Rect) {
+        self.child_bounds.extend_with(rect.min);
+        self.child_bounds.extend_with(rect.max);
+    }
+
+    /// Bounding box of all contained children
+    pub fn child_bounds(&self) -> Rect {
+        self.child_bounds
+    }
+
+    pub fn force_set_child_bounds(&mut self, child_bounds: Rect) {
+        self.child_bounds = child_bounds;
+    }
+
     // ------------------------------------------------------------------------
     // Layout related measures: