Improved map rendering, shops, light bugfix, junction boxes wont break as easily

Subsurface/GUI/GUIComponent.cs

@@ -298,9 +298,9 @@ namespace Subsurface
 
         public virtual void DrawChildren(SpriteBatch spriteBatch)
         {
-            foreach (GUIComponent child in children)
+            for (int i = 0; i < children.Count; i++ )
             {
-                child.Draw(spriteBatch);
+                children[i].Draw(spriteBatch);
             }
         }
 

Subsurface/GUI/GUIListBox.cs

@@ -280,7 +280,10 @@ namespace Subsurface
                         Debug.WriteLine("clicked");
                         selected = child;
                         if (OnSelected != null)
-                            OnSelected(child.UserData);
+                        {
+                            if (!OnSelected(child.UserData)) selected = null;
+                        }
+
                     }
                 }
                 else