Exception Handling - Table Lock

 Hello,

     I am using  the when_button_pressed trigger  in my form..  I am trying to check that a table or record is not locked by another user or process,  before i make an update.

    Is there a way, perhaps an exception handling method to  check for this.  And if there is one,  then i would just display a message for this.

   I thought there might be a way,  similiar to using exceptions like  when no_data,  or when too_many_rows.....

  Any help is appreciated.

   Thanks Jim Borror