fix header files so that they can be included directly without generating 'undefined reference' errors

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@52638 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/tbarbase.cpp

@@ -125,6 +125,7 @@ void wxToolBarToolBase::SetDropdownMenu(wxMenu* menu)
     m_dropdownMenu = menu;
 }
 
+
 // ----------------------------------------------------------------------------
 // wxToolBarBase adding/deleting items
 // ----------------------------------------------------------------------------
@@ -596,6 +597,12 @@ void wxToolBarBase::SetRows(int WXUNUSED(nRows))
     // nothing
 }
 
+bool wxToolBarBase::IsVertical() const
+{
+    return HasFlag(wxTB_LEFT | wxTB_RIGHT);
+}
+
+
 // ----------------------------------------------------------------------------
 // event processing
 // ----------------------------------------------------------------------------