See the attached!
For a *.ctl (control) that's a cluster:
1. How is Index Display added? For the attached example, I know it is displayed by Right Click -->Visible Items. But when created from scratch, this option is unavailable.
2. Why would one use and Index Display on such a control?
3. There's a number in the upper RH side of the icon of the *.ctl. What does this indicate and how does it change?