CMD_PLACE_LSTRING

Hi,

I need to send place lstring command through mdlInput_sendCommand in
V7.

I've given this function in a button event.
mdlInput_sendCommand (CMD_PLACE_LSTRING, "", 0, NULL, PLACEMENT);

But, when I click the button, Microstation displays, Unknown key-in or
command.

Any suggestions ?

Thanks in advance
Siva