Hi Sakthi!
I don't know that you are responding to this thread or responding to the Incident ID: 75427.
I did attach the stand alone application where there was no Telnet at all (only a Ribbon and a TextBox). The problem is not the Telnet, the problem is the Ribbon)
Steps to reproduce the problem:
1)Run the application.(which I attach to this post)
2)Enter some text in to the textBox
3)Press "F10" (ONLY ONE because it acts like toggle button press One time: Disable, press second time: it enables button)
4)Click back to the text Box.
5)Enter some text ==> most of the key strokes are disabled
The application I attach with this post is the application that I provided you (the Incident ID: 75426)
I will also post this message to the Incident ID: 75426 too.
Thanks!
SyncfusionF10Bug_fbd204c7.rar