public Canvas getViewPanel() {
DataSource eventDS = new DataSource();
DataSourceSequenceField eventIdField = new DataSourceSequenceField("eventId");
eventIdField.setPrimaryKey(true);
DataSourceTextField nameField = new DataSourceTextField("name");
DataSourceTextField descField = new DataSourceTextField("description");
DataSourceDateField startDateField = new DataSourceDateField("startDate");
DataSourceDateField endDateField = new DataSourceDateField("endDate");
eventDS.setFields(eventIdField, nameField, descField, startDateField, endDateField);
eventDS.setClientOnly(true);