Popoy,
add this line to your project init code or at some other global place
EXTERN "WinConst.WL"
put this line in de opening or init section of your main-window
Event("YourProc", "*.", WM_INPUTLANGCHANGEREQUEST)
And create a procedure in this window like this
PROCEDURE YourProc(nMessage, wParam, lParam)
YourProc should now run whenever the language is changed
Not tested and check the help on Event() for more info
Arie