diff --git a/lib/cyberarm_engine/ui/elements/container.rb b/lib/cyberarm_engine/ui/elements/container.rb
index 24a50fa..334883b 100644
--- a/lib/cyberarm_engine/ui/elements/container.rb
+++ b/lib/cyberarm_engine/ui/elements/container.rb
@@ -36,6 +36,9 @@ module CyberarmEngine
         @children.clear
 
         block.call(self) if block
+
+        recalculate
+        root.gui_state.request_recalculate
       end
 
       def render