Thanks, that will help me out most likely.
But immediately I ran into a couple of problems:
3. Create the following Controls to the form
Name: CtlBack
Control Source: =IIf([SelTop]=[ctlCurrentLine],"ÛÛÛÛÛÛÛÛÛÛÛÛ",Null)
"Û" is character 0219, the easiest way to enter this is to copy and paste...