I have schedule control and all is good. The problem happens when user leaves browser open for some time and it looks like page gets reloaded so all expanded groups collapsed at this point. I have auto refresh disabled so I am really scratching my head why it gets reloaded on its own.
The Scheduler should invoke any requests by itself (if AutoRefresh is disabled). Even with AutoRefresh enabled the refresh shouldn't collapse the tree nodes (the tree state is persisted during CallBacks).
If you leave the page open with the browser developer tools enabled, do you see any requests under the Network tab?
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DayPilot