+- wxNB_HITTEST_* flags renamed to wxBK_HITTEST_* to serve all book controls.
+- Added wxTopLevelWindow::SetTransparent and CanSetTransparent, with
+ implementations (so far) for wxMSW and wxMac.
+- Allow customizing individual grid lines appearance (Søren Lassen)
+- Fixed middle click events generation in generic wxTreeCtrl (Olly Betts)