Use the column labels to determine the minimal width required by the control to show them all in full. Also declare all image list and column-related wxListCtrl methods in wxListCtrlBase now as we need some of them in DoGetBestClientSize() implementation. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@70282 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775