added initialize function to pages.

RecrownedAthenaeum/UI/Book/Book.cs

@@ -76,6 +76,7 @@ namespace RecrownedAthenaeum.UI.Book
         {
             foreach (Page page in pages)
             {
+                page.Initialize();
                 this.pages.Add(page.Name, page);
             }
         }

RecrownedAthenaeum/UI/Book/Page.cs

@@ -39,5 +39,13 @@ namespace RecrownedAthenaeum.UI.Book
             bounds.Height = height;
             requiresSizeUpdate = false;
         }
+
+        /// <summary>
+        /// Called only once after a page is added to a <see cref="Book"/>. Generally used to instantiate the modules of the page.
+        /// </summary>
+        protected internal virtual void Initialize()
+        {
+
+        }
     }
 }