Obtaining Data From Another Table Cgridview Widget

Hello,

I am currently trying to use the CGridView widget. I am posting as I am unsure as to how to get a column from another table (target_name from the target table) and have it displayed in the table used in CGridView. I have 3 tables; drug_has_target is my intermediate table, which is linked to drug and target. Currently, CGridView is using the drug_has_target (intermediate!) table. I would like to;

1) add an extra column in this widget

2) have the content of the extra column to be target_name (from table 2, an FK of intermediate table points to PK of this table)

I would like to know how to go about this ..how can I add a column and "fetch" the content from a different table which is linked. I've tried different options which I saw online, but they didn't work ... would say that drug_has_target.target.target_id is not defined (or something along these lines). Curious to know if I need to create relations +attribute label in the drug_has_target model script in order to add this to the CGridView widget.

Drug (table 1):
drug_id (PK)
drug_name

Target (table 2):
target_id (PK)
target_name

drug_has_target (table 3, *intermediate table*):
drug_id (FK1)
target_id (FK2)

Current relations:

//drug_has_target.php (model)
public function relations()
	{
		// NOTE: you may need to adjust the relation name and the related
		// class name for the relations automatically generated below.
		return array(
			'drug' => array(self::BELONGS_TO, 'Drug', 'drug_id'),
			'target' => array(self::BELONGS_TO, 'Target', 'target_id'),
		);
	}

	/**
	 * @return array customized attribute labels (name=>label)
	 */
	public function attributeLabels()
	{
		return array(
			'drug_id' => 'Drug',
			'target_id' => 'Target',
		);
	}

I don't really know what I am doing (newbie), so if you can manage to be explicit with your solution, that would be VERY much appreciated!

Thank you!
Tanya