Thanks Ianko for your reply, This solution works fine. "editor.focusFirstText()" function is set focus on first line of editor content which is fine but after that when i click enter key then nothing happen.I checked that enter key click event is fire but cursor in stick on first line.
Steps to reproduce the issue.
1 - In editor NewLineMode="Br".
2 - Add below content HTML mode.
<html><head> </head><body>test<br><br>test<br><br>test<br><br>test<br><br>test</body></html>
3 - Back to Design mode(Cursor is set on first line).Press enter key
Result : Cursor in stick instead of add <br> tag.
In above scenario Enter key works fine when press any other key before enter key.
Please suggest.
Thanks.