When I use the command of regen in opening some layers ( not all) condition, then I switch to other layers , the objects of the whole drawing are not show up, I must to use the re again to show up. I don't want to use it every time.How to show it up automatically?(ps: cad2009;in the Model Space;the REGENAUTO is on and regenmode is 1;the objects is all 2d;the condition as the grapic to following)