Some features don't works in custom builds

Some features don't works in custom builds

Hello!

I'm using jQuery Download Builder and build my own packages. But in the downloaded package the dialogs can't be draggable, and/or resizable. But everything works fine if i add this additional js to the code:

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/jquery-ui.min.js"></script>

I can't find any description about this issue in the documentation. I'm doing some things wrong?