public Object setDynamicProperty(String key, Object value) {
        if (dynamicProperties == null) {
            dynamicProperties = new HashMap<>();
        }
        return dynamicProperties.put(key, value);
    }
@param resizable Whether the event should be resizable. Setting
{@code null} means that the default of the schedule is applied.
Otherwise, this setting overrides the default of the schedule.
primefaces/src/main/java/org/primefaces/model/DefaultScheduleEvent.java