Add GetScrollHelper() to wxWindow.

Let wxScrollHelper set the underlying field itself.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@41205 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/wincmn.cpp

@@ -200,6 +200,8 @@ wxWindowBase::wxWindowBase()
 
     m_virtualSize = wxDefaultSize;
 
+    m_scrollHelper = (wxScrollHelper *) NULL;
+
     m_minVirtualWidth =
     m_maxVirtualWidth = wxDefaultCoord;
     m_minVirtualHeight =