How to use the hint.Level.Incomplete function in hint

SC.$("#" + outputId).removeClass("cmd_error");
                }
            });

            this.link(content, "completed", function(completed) {
                SC.$("#" + throbId).css({
                    "display": completed ? "none" : "block"
                });
            });
        }
    }
});

var hintClass = {};
hintClass[Level.Error] = "cmd_error";
hintClass[Level.Incomplete] = "cmd_incom";
hintClass[Level.Warning] = "cmd_warn";
hintClass[Level.Info] = "cmd_info";

/**
 * A view designed to dock in the bottom of the editor, holding the command
 * line input.
 * <p>
 * TODO: We need to generalize the way views attach to the editor, but now isn't
 * the right time to work on this. We're locked to the bottom.
 */
exports.CliInputView = SC.View.design({
    dock: dock.DOCK_BOTTOM,
    classNames: [ "cmd_line" ],
    layout: { height: 300, bottom: 0, left: 0, right: 0 },
    childViews: [ "contentView" ],
    hasFocus: false,</p>