This is far from perfect but better than alternative as freezing this control by sending WM_SETREDRAW to it can result in completely broken behaviour as explained in http://support.microsoft.com/kb/130611. And not freezing it at all shows horrible flicker when adding even a relatively small number of items at once to the control because it recalculates and repositions its scrollbars after every parent node addition. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72665 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775