[TYPO3-dev] Updating TCA selector field "Available items:"

[ktt]

I have a multiple values selector with contents from a database table:

$tempColumns = array (
	array (		
		'exclude' => 1,		
		'label' => 'ssssssssss',		
		'config' => array (
			'type' => 'select',
			'foreign_table' => 'fe_groups',
			'foreign_table_where' => 'ORDER BY fe_groups.title DESC',
			'size' => 10,	
			'maxitems' => 20,
			'default' => ''
		)
	),
);

It reads values from fe_groups to "Available items:" field(right).
How could I update the left field "Selected Items:" if values were selected somethere else, let's say in other tab?

Thank you in advance,
Kast A.