If you have ever had to modify a lot of dimensions in AutoCAD, you know how many properties there are and how finding just the right one can be time-consuming. This routine from Walt Bedinger performs one particular task — hiding extension lines — but it allows you to do this by picking the dimension instead of hunting for the correct item in the Properties palette. It gets better: You can also turn them back on by choosing the dimension. To use this routine, load the LISP file and type in the command XLTGL. If you select a dimension line, the nearest extension line will turn off, or if it is already hidden it will turn back on. If you select an extension line, it will turn off. To top off this functionality, the LISP code contains plenty of comments, making adjustments or changes to suit your needs very easy. Great job, Walt!