Don't you mean ManyManyDataObjectManager? If not, you're in the wrong place!

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What do you mean "the forum documents on the module?" What is "datamodel manager?"

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My question is what controls the layout of a hasmanydataobject in the model admin when calling it to an addtab field?

Please advise if I need to provide more detail.

Thanks for your patience as I try to explain this.

Nuts. I was going to attach a screenshot but cant'. I'll paste here. It very closely exactly like what is below. Notice Firstname and Last name are not columns like the example documents for data object manager, they are crammed together in a single column. I am trying to get this to display in a nice columar layout. But it is all squeezed together and does not appear to be using a theme.

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Add An Individual
Displaying 1 to 10 of 49

*
First Name
Last Name
deselect all
*
Jeb
Furious Edit Delete
*
Zeb
Allman Edit Delete
*
Patricia
Allman Edit Delete
*
Mike
Allman Edit Delete
*

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Here's the code:
class Family extends DataObject {
...

function getCMSFields() {
$fields=parent::getCMSFields();
$fields->renamefield('Name', _t('Family.SURNAME'));
$fields->renamefield('City',_t('Family.CITY'));
$fields->renamefield('StateProvince',_t('Family.STATEPROVINCE'));
$fields->renamefield('Postalcode',_t('Family.POSTALCODE'));

$tablefield = new HasManyDataObjectManager(
$this,
'Individuals',
'Individual',
array(
'FirstName' => 'FirstName',
'LastName' => 'LastName'
),'getCMSFields_forPopup');

$tablefield->setAddTitle( 'An Individual' );
$fields->addFieldToTab( 'Root.Individuals', $tablefield );
return $fields;
}
...
}