Hello,
I've found a bug in cxTreeList while hiding columns via CustomCheckBoxList. An exception raises when OptionsBehavior.FocusCellOnCycle property is set on True and user hides last visible column.
I've attached a sample where you can produce this bug. Just open the custom checkboxlist and hide all three columns. You get the bug after hiding the last one.
Regards from Prague,
Jaroslav Nechyba
Hello Jaroslav,
Thank you for your sample project. I have reproduced the described behavior and forwarded this ticket to our developers for research.