Add doc for wxFlexGridSizer::GetRowHeights and GetColWidths

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@75578 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/sizer.h

@@ -1640,6 +1640,16 @@ public:
     */
     void SetNonFlexibleGrowMode(wxFlexSizerGrowMode mode);
 
+    /**
+       Returns a read-only array containing the heights of the rows in the sizer.
+    */
+    const wxArrayInt& GetRowHeights() const;
+
+    /**
+       Returns a read-only array containing the widths of the columns in the sizer.
+    */
+    const wxArrayInt& GetColWidths() const;
+
     virtual void RecalcSizes();
     virtual wxSize CalcMin();