diff --git a/libs/ui/source/controller.cpp b/libs/ui/source/controller.cpp
index d1d5f4a9..aebd51e9 100644
--- a/libs/ui/source/controller.cpp
+++ b/libs/ui/source/controller.cpp
@@ -1,6 +1,7 @@
 #include <psemek/ui/controller.hpp>
 
 #include <psemek/ui/painter_impl.hpp>
+#include <psemek/ui/box_shape.hpp>
 #include <psemek/gfx/gl.hpp>
 #include <psemek/util/recursive.hpp>
 #include <psemek/geom/camera.hpp>
@@ -8,12 +9,54 @@
 namespace psemek::ui
 {
 
+	namespace
+	{
+
+		struct root_proxy
+			: element
+		{
+			children_range children() const override
+			{
+				return children_range{&root_raw, &root_raw + 1};
+			}
+
+			struct shape const & shape() const override
+			{
+				return shape_;
+			}
+
+			using element::reshape;
+
+			void reshape(geom::box<float, 2> const & bbox)
+			{
+				shape_.box = bbox;
+				if (root)
+					root->reshape(bbox);
+				if (on_reshape)
+					on_reshape();
+			}
+
+			geom::box<float, 2> size_constraints() const override
+			{
+				return root->size_constraints();
+			}
+
+			void draw(painter &) const override {}
+
+			std::shared_ptr<element> root;
+			element * root_raw = nullptr;
+			box_shape shape_;
+			std::function<void()> on_reshape;
+		};
+
+	}
+
 	struct controller::impl
 	{
 		async::executor * loop;
 		painter_impl painter;
-		std::shared_ptr<element> root;
-		geom::box<float, 2> shape{{{0.f, 0.f}, {0.f, 0.f}}};
+		std::shared_ptr<root_proxy> root;
+		std::optional<geom::point<int, 2>> mouse;
 
 		impl(async::executor * loop);
 
@@ -23,7 +66,14 @@ namespace psemek::ui
 
 	controller::impl::impl(async::executor * loop)
 		: loop(loop)
-	{}
+		, root{std::make_shared<root_proxy>()}
+	{
+		root->set_loop(loop);
+		root->on_reshape = [this]{
+			if (mouse)
+				event(mouse_move{*mouse});
+		};
+	}
 
 	template <typename E>
 	bool controller::impl::event(E const & e)
@@ -49,31 +99,33 @@ namespace psemek::ui
 
 	std::shared_ptr<element> controller::set_root(std::shared_ptr<element> r)
 	{
-		auto old = std::move(impl().root);
-		impl().root = std::move(r);
-		if (old) old->set_loop(nullptr);
-		if (impl().root)
-		{
-			impl().root->set_loop(impl().loop);
-			impl().root->reshape(impl().shape);
-		}
+		auto old = std::move(impl().root->root);
+		if (old)
+			old->set_parent(nullptr);
+
+		impl().root->root = std::move(r);
+		impl().root->root_raw = impl().root->root.get();
+		if (impl().root->root)
+			impl().root->root->set_parent(impl().root.get());
+
+		impl().root->reshape();
+
 		return old;
 	}
 
 	element * controller::root()
 	{
-		return impl().root.get();
+		return impl().root->root.get();
 	}
 
 	void controller::reshape(geom::box<float, 2> const & shape)
 	{
-		impl().shape = shape;
-		if (impl().root)
-			impl().root->reshape(impl().shape);
+		impl().root->reshape(shape);
 	}
 
 	bool controller::event(mouse_move const & e)
 	{
+		impl().mouse = e.position;
 		return impl().event(e);
 	}
 
@@ -105,8 +157,7 @@ namespace psemek::ui
 				if (c) self(c);
 		});
 
-		if (impl().root)
-			visitor(impl().root.get());
+		visitor(impl().root.get());
 
 		impl().painter.render(geom::window_camera{rt.viewport[0].length(), rt.viewport[1].length()}.transform());
 	}