Show Hidden Borders

As of PeopleTools 8.52, there's a nifty application designer feature called "Show Hidden Borders" which displays the borders of page items that have the hidden border property set.

The setting is enabled in Application Designer through:

Tools > Options > General > Show Hidden Borders

This is an example of what this does on a group box where the borders have been hidden in the group box properties. Notice the dashed lines around the hidden border.