Insert TEX code with right to left language text (persian,arabic, ...)

[jalil]

Hello!
When inserted Tex code with Persian words (RTL language)
my words in Persian  is shown in lyx editor in LTR
for example like this
\rl{ی ل ت}
but this is correct:
\rl{تلی} 

How can i insert both RTL and LTR texts in TeX mode?