Add expand/collapse button to wxRibbonBar.

This allows the user to toggle the ribbon bar visibility.

Closes #14530.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72261 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/ribbon/bar.h

@@ -64,7 +64,8 @@ public:
     @beginStyleTable
     @style{wxRIBBON_BAR_DEFAULT_STYLE}
         Defined as wxRIBBON_BAR_FLOW_HORIZONTAL |
-        wxRIBBON_BAR_SHOW_PAGE_LABELS | wxRIBBON_BAR_SHOW_PANEL_EXT_BUTTONS
+        wxRIBBON_BAR_SHOW_PAGE_LABELS | wxRIBBON_BAR_SHOW_PANEL_EXT_BUTTONS |
+        wxRIBBON_BAR_SHOW_TOGGLE_BUTTON.
     @style{wxRIBBON_BAR_FOLDBAR_STYLE}
         Defined as wxRIBBON_BAR_FLOW_VERTICAL | wxRIBBON_BAR_SHOW_PAGE_ICONS
         | wxRIBBON_BAR_SHOW_PANEL_EXT_BUTTONS |
@@ -83,6 +84,9 @@ public:
     @style{wxRIBBON_BAR_SHOW_PANEL_MINIMISE_BUTTONS}
         Causes minimise buttons to be shown on panels (where the panel has
         such a button).
+    @style{wxRIBBON_BAR_SHOW_TOGGLE_BUTTON}
+        Causes a toggle button to appear on the ribbon bar at top-right corner.
+        This style is new since wxWidgets 2.9.5.
     @endStyleTable
 
 
@@ -103,6 +107,9 @@ public:
         Triggered when the right mouse button is released on a tab.
     @event{EVT_RIBBONBAR_TAB_LEFT_DCLICK(id, func)}
         Triggered when the left mouse button is double clicked on a tab.
+    @event{EVT_RIBBONBAR_TOGGLE_BUTTON_CLICK(id, func)}
+        Triggered when the button triggering the ribbon bar is clicked. This
+        event is new since wxWidgets 2.9.5.
     @endEventTable
 
     @library{wxribbon}