Request new features or modifications
At this moment we do not support this, but we already have a feature request here: https://github.com/bryntum/support/issues/1758
We had this question before, I've provided some workaround in this thread, please take a look: viewtopic.php?p=78558#p78558
It may help you too.
Ticket above was a duplicate, correct ticket to track: https://github.com/bryntum/support/issues/1355