added wxConstCast to fix compilation error

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_2_BRANCH@7325 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/wizard.cpp

@@ -317,7 +317,7 @@ wxSize wxWizard::GetPageSize() const
 {
     // make sure that the controls are created because otherwise m_width and
     // m_height would be both still -1
-    DoCreateControls();
+    wxConstCast(this, wxWizard)->DoCreateControls();
 
     return wxSize(m_width, m_height);
 }