dhtmlxscheduler_dhx_terrace.css seems to be incorrect

I have followed the instructions provided on page docs.dhtmlx.com/doku.php?id=dhtm … w_to_start and the scheduler appears to display correctly with the default theme “dhtmlxscheduler.css” as well as with “dhtmlxscheduler_glossy.css”. However when the “dhtmlxscheduler_dhx_terrace.css” is used, the buttons on the top of the Scheduler are not put into proper position. Attached is the “SchedulerTest.zip” which contains the test case. It also includes the image “ShowsHowItRenderswithFirefox18.0.2.png” shows how it renders in my browser.
SchedulerTest.zip (319 KB)

be sure to include extra js file - ext/dhtmlxscheduler_dhx_terrace.js

<script src="../../codebase/dhtmlxscheduler.js" type="text/javascript" charset="utf-8"></script> <script src="../../codebase/ext/dhtmlxscheduler_dhx_terrace.js" type="text/javascript" charset="utf-8"></script>

Thank you Stanislav, this resolved it.