vt220/vt320 function keys are not working [2]

I am trying the new XShell v3.0 and recognized that the vt220/vt320 emulations are not working properly.
The functions keys F6-F12 are not sending the correct key codes. They were working properly in the 2.1 version but not working anymore in the 3.0 version.
This is a major drawback for people heavily using applications that rely on function keys.

Have you tried setting the function key type to VT400 on Terminal > Keyboard in the session properties dialog box?

I didn't recognized the "Function Key Type" option.
I tried setting the Function Key Type to vt400 and the keys F6-F12 worked but this time F1-F5 keys did not work:( However, I solved my problem by setting Function Key Type to "Xterm R6" which enables all the function keys.

Thank you for your help.