New Right to Left problem in Windows CE

When a ui form's 'layoutDirection' property had set to "RightToLeft", it wasn't really changed and it has same "LeftToRight" functionality. The problem was not appeared in version 4.6.3.
Example:
Assume you have a label with "سلام" in its text property. when you append a colon ":" at its end, the colon will be placed at the beginning of expression that it's not correct.
look at this:
1)"salam"
2)"salam" + ":"
3)result-> ":salam" (incorrect)
4)correct-> "salam:"