Hey All. Was hoping for a bit of help again.

I have the folowing code defining a page which works great:

Speakerpage.php

<?php 
class SpeakersPage extends SiteTree { 
public static $db = array( 
'RightContent' => 'HTMLText', 
); 
public static $many_many = array( 
'Speakers' => 'Speaker', 
'KeyNoteSpeakers' => 'Speaker', 
); 
function getCMSFields() { 
$fields = parent::getCMSFields(); 
$fields->addFieldToTab( 'Root.Content.Speakers', new ManyManyDataObjectManager( 
$this, 
'Speakers', 
'Speaker' 
)); 

$fields->addFieldToTab( 'Root.Content.KeyNoteSpeakers', new ManyManyDataObjectManager( 
$this, 
'KeyNoteSpeakers', 
'Speaker' 
));

return $fields; 
} 
} 
...

Having looked around I can see that the functions I'm looking for to change the default behaviour of the 'results per page' on my cms are

$myDOM->setPerPageMap();
$myDOM->setPageSize();

Problem is I'm not sure as per the above code where to put these functions?

I've tried below but this causes the site to break? Any suggestions of what I am doing wrong?

<?php 
class SpeakersPage extends SiteTree { 
public static $db = array( 
'RightContent' => 'HTMLText', 
); 
public static $many_many = array( 
'Speakers' => 'Speaker', 
'KeyNoteSpeakers' => 'Speaker', 
); 
function getCMSFields() { 
$fields = parent::getCMSFields(); 
$fields->addFieldToTab( 'Root.Content.Speakers', new ManyManyDataObjectManager( 
$this, 
'Speakers', 
'Speaker' 
)); 

$fields->addFieldToTab( 'Root.Content.KeyNoteSpeakers', new ManyManyDataObjectManager( 
$this, 
'KeyNoteSpeakers', 
'Speaker' 
));


$fields->setPageSize(50);

return $fields; 
} 
} 
...

You run them against a DataObjectManager instance..

$yourDOM->setPageSize(50);

Thanks for the reply unclleCheese. I tried that as per the code above

$fields->setPageSize(50);

and it didn't work. Getting an 'error on the cms everytime I try to access the page. Is it because I have two doms running on that page with the same name?

$fields is a FieldSet object, not a DataObjectManager.

$fields->addFieldToTab("Root.Content....", $dom = new DataObjectManager(.....));

$dom->setPageSize(50);

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Thanks sir. That did the trick. I just assumed $fields was a variable for the dom. Need to look into that one.