Iphone scrolling problems with responsive calendar

Hi there,

I have implemented the calendar Version 4.3 in on this webpage. We are using the responsive css and we have adjusted it to our needs, by adding some positions in the modular that opens when you enter a new entry:

vmtest1.de/vm/_calendar_test-2.php

Now I ran into an issue on the iphone: It seem when you add a new entry in the calendar the overlaying div.dhx_cal_light_wide is not scrolling anymore on all the positions, instead the underlying .dhx_cal_data is scrolling. If I set .dhx_cal_data to overflow:hidden the overlaying div.dhx_cal_light_wide is scrolling again. Is there a fix to this problem? I have read that the iphone has some issues when it comes to z-inde, but I didn’t find any solution that works for me.

Is there someone else who ran in this problem, I searched the forum, but I did´t find the same problem.