Hello,

I am trying to Decorate the EventCalendar module. I've created the following class:

<?php
class CustomCalendarEvent extends DataObjectDecorator {
    function extraStatics() {
        return array(
            'db' => array(
			   'Location' => 'Text',
			   'ShortDesc' => 'Text',
			   'MarketingMessage' => 'Text',
            ),
            'has_one' => array(
			   'FullImage' => 'Image',
			   'Thumb' => 'Image'
            ),
        );
    }
	
	public function getCMSFields() {
		$this->extend('updateCMSFields', $fields);
		return $fields;
	}
	
	public function updateCMSFields(FieldSet $fields) {
		$fields->push(new TextField('Location', 'Event Location'));
		$fields->push(new TextField('ShortDesc', 'Short Description'));
		$fields->push(new TextField('MarketingMessage', 'Marketing Message'));
		$fields->push(new ImageField('FullImage', 'Full Image'));
		$fields->push(new ImageField('Thumb', 'Thumbnail Image'));
	}
}

How can I make the new fields show up inside the CMS fields - such as Content.Main or a new Content.Images?

Try the following:

public function updateCMSFields(FieldSet &$fields) {
	$fields->addFieldToTab('Root.Content.Main', new TextField('Location', 'Event Location'));
}

or

public function updateCMSFields(FieldSet &$fields) {
	$fields->addFieldToTab('Root.Main', new TextField('Location', 'Event Location'));
}