Calendar In Grid Behind Window

I had asked this question just before but from the response I missed a piece of the problem so I will resubmit.

I have the professional edition and when you try to open a new dhxwindow from a page and you attach a grid and one of the grid columns is a calendar, the calendar appear behind the window. I tried adjusting the z-index of the calendar but it doesnt seem to work. This is a real issue since I need the grid in the popup window and a column has to be a calendar.

This works fine in on a single page. What I am talking about is from this page, open a new dhtmlx modal window with a grid attached and a column being a calendar. This is where the problem is.



Please, provide the complete demo that allows to recreate the issue (you can also send to