Hi Keiichi-kun,
I had the same issue and managed to sort it out using hidden fields, not sure if it's the ideal solution but it got me to where I wanted to get. Hopefully I don't miss any details as it's been quite a while since I created this.
First and foremost, i created a hidden field:
Then I added Custom attribtues to the scheduler, like so:
When pasting, I populate the hidden field:
Finally, in code behind, in the FormCreated event, I'm doing the following:
If you're using custom editors, you'd need to do something like this:
Hope this helps, if you need more help let me know.
Thanks,
Daryl