Next button not working in the dhtmlx scheduler tree time

Scheduler Javascript
#1

Hi sir

i am using dhtmlx Scheduler tree time line and also i am using previous and next button .when i go previous button its working fine.but when i click next button its does not work.i dont know what mistake i am doing.please provide the solution as soon as possible.
my code is below:

 
 
	</div>
	<div class="dhx_cal_header">
	</div>
	<div class="dhx_cal_data">
	</div>		
</div>
#2

i want to show scale only for 24 hour
eg:00:00 to 23:00

#3

Hi sir
Now i know that what mistake i am doing .i solve my issue sorry for that i post my issue here .