Added wxPropertyGridInterface::SetColumnProportion(); wxPG_SPLITTER_AUTO_CENTER window style now supports column counts higher than two.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@63481 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/propgrid/propgridpagestate.h

@@ -547,6 +547,8 @@ public:
 
     void DoRemoveFromSelection( wxPGProperty* prop );
 
+    void DoSetColumnProportion( unsigned int column, int proportion );
+
     wxPropertyCategory* GetPropertyCategory( const wxPGProperty* p ) const;
 
     wxPGProperty* GetPropertyByLabel( const wxString& name,
@@ -704,6 +706,9 @@ protected:
     /** List of indices of columns the user can edit by clicking it. */
     wxArrayInt                  m_editableColumns;
 
+    /** Column proportions */
+    wxArrayInt                  m_columnProportions;
+
     double                      m_fSplitterX;
 
     /** Most recently added category. */