Add XRC handler for wxSimplebook.

Similar to wxNotebook but even simpler as wxSimplebook doesn't use images.

Also add wxSimplebook::Create() as the version inherited from wxBookCtrlBase
didn't _quite_ work: we need to add wxBK_TOP style to prevent asserts due to
unknown alignment in the base class when creating wxSimplebook.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77010 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

misc/schema/xrc_schema.rnc

@@ -203,6 +203,7 @@ builtinWindowClasses =
     | wxScrollBar
     | wxScrolledWindow
     | wxSimpleHtmlListBox
+    | wxSimplebook
     | wxSlider
     | wxSpinButton
     | wxSpinCtrl
@@ -292,6 +293,7 @@ builtinClassesNames =
     | "wxScrollBar"
     | "wxScrolledWindow"
     | "wxSimpleHtmlListBox"
+    | "wxSimplebook"
     | "wxSlider"
     | "wxSpinButton"
     | "wxSpinCtrl"
@@ -332,6 +334,7 @@ builtinNestedClassesNames =
     | "notebookpage"
     | "choicebookpage"
     | "listbookpage"
+    | "simplebookpage"
     | "treebookpage"
     | "propertysheetpage"
     | "ownerdrawnitem"
@@ -1276,6 +1279,24 @@ wxSimpleHtmlListBox =
     }
 
 
+wxSimplebook =
+    element object {
+        attribute class { "wxSimplebook" } &
+        stdObjectNodeAttributes &
+        stdWindowProperties &
+        (wxSimplebook_simplebookpage | objectRef)*
+    }
+
+wxSimplebook_simplebookpage =
+    element object {
+        attribute class { "simplebookpage" } &
+        platform &
+        element label {_, t_text }* &
+        [xrc:p="o"] element selected {_, t_bool }* &
+        windowNode
+    }
+
+
 wxSlider =
     element object {
         attribute class { "wxSlider" } &