GridView in DropDown

are there ways with Yii to place the GridView in the DropDownList?
I have dropdownlist:

echo CHtml::DropDownList('from', '', $tabl, array('style' => 'width: 100%;' ,'id' => 'from'));

$tabl is widget(‘zii.widgets.grid.CGridView’, array( … )

And I get error
Object of class CDataColumn could not be converted to string
How I send to source of dropdown CGridView widget?