Fixed drawing problem when using scrollbars or mouse wheel

Implemented checkbuttons

git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@57 8e941d3f-bd1b-0410-a28a-d453659cc2b4

components/virtualtreeview/vtlogger.pas

@@ -25,6 +25,8 @@ const
   lcSetCursor = 10;//it generates a lot of messages. so it will be debugged alone
   lcPaintBitmap = 11;
   lcScroll = 12;
+  lcPaintDetails = 13;
+  lcCheck = 14;
 
 var
   Logger: TLCLLogger;