Send DEL key on MC9090 or MC9190

We recently starting using an application that requires the DEL key to be pressed for a specific function.  I cannot seem to find any way to send this with the 53-key keyboard on a MC9090 or MC9190.  I have tried every combination of Func+BKSP, Shift+BKSP, Ctrl+BKSP, etc.  The only way I can send the correct key is to bring in the on-screen keyboard and send it that way.

 

Does anyone know of a way to send a DEL key?

 

Thanks