A status is a label where messages can be stacked. Only the message at the top of the stack is displayed. Each message has an id, which can be used to remove the message even if not on top of the stack.
inherit labelmethod push : string -> Status_msg_id.ts#push msg pushes new message msg and returns message id.
v#pop pops message from the stack. If the stack is not empty, then the new message on top is displayed.
method remove : Status_msg_id.t -> unitv#remove id removes message with given id from the stack.