Add support for Cocoa's selectable toolbar items.

The support is currently limited to making all toolbar items selectable
and is only available in wxOSX with Cocoa and native toolbars.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@73575 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/osx/toolbar.h

@@ -72,6 +72,10 @@ class WXDLLIMPEXP_CORE wxToolBar: public wxToolBarBase
 #endif
 
 #if wxOSX_USE_NATIVE_TOOLBAR
+    // make all tools selectable
+    void OSXSetSelectableTools(bool set);
+    void OSXSelectTool(int toolId);
+
     bool MacInstallNativeToolbar(bool usesNative);
     void MacUninstallNativeToolbar();
     bool MacWantsNativeToolbar();