adding an extra search field dinamically and filterChanged

I have setted a custom menu Item and on click on this item i set an extra input field to filter the column.

If use the first search field the filterChanged works, but i use the second field(the new once) the filterChanged is not triggered.

Do i miss something or is it a bug=

Here the plnkr to see the problem: http://plnkr.co/edit/AvUOzpX2tcgZlG8GoNfk

NOTE: The column is 'gender'. You must click on the menu button and choose Search From/To.