In select multiselect, event onDeselectAll not work.

The event onDeselectAll no work.
Example Code:

 $('#ls_groups').multiselect({
        onChange: function(option, checked, select)
        {
            console.log("onChange");
        },
        onSelectAll: function()
        {
            console.log("onSelectAll");
        },
        onDeselectAll: function()
        {
            console.log("onDeselectAll");
        },
});