Update header control when wxPropertyGridManager is resized.

Closes #14762.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72711 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/propgrid/manager.cpp

@@ -1906,6 +1906,11 @@ void wxPropertyGridManager::OnResize( wxSizeEvent& WXUNUSED(event) )
             }
         }
     }
+
+#if wxUSE_HEADERCTRL
+    if ( m_showHeader )
+        m_pHeaderCtrl->OnColumWidthsChanged();
+#endif
 }
 
 // -----------------------------------------------------------------------