diff --git a/libs/ui/include/psemek/ui/container_impl.hpp b/libs/ui/include/psemek/ui/container_impl.hpp
index f97a1b26..1f0c827c 100644
--- a/libs/ui/include/psemek/ui/container_impl.hpp
+++ b/libs/ui/include/psemek/ui/container_impl.hpp
@@ -15,6 +15,8 @@ namespace psemek::ui
 
 		element::children_range children() const;
 
+		std::size_t size() const;
+
 		std::size_t add(std::shared_ptr<element> c);
 		void add(std::shared_ptr<element> c, std::size_t index);
 
diff --git a/libs/ui/source/container_impl.cpp b/libs/ui/source/container_impl.cpp
index 5866e085..d13b9899 100644
--- a/libs/ui/source/container_impl.cpp
+++ b/libs/ui/source/container_impl.cpp
@@ -8,6 +8,11 @@ namespace psemek::ui
 		return element::children_range{children_range_.data(), children_range_.data() + children_range_.size()};
 	}
 
+	std::size_t container_impl::size() const
+	{
+		return children_.size();
+	}
+
 	std::size_t container_impl::add(std::shared_ptr<element> c)
 	{
 		std::size_t index = 0;