Calendar display Error in DhtmlGrid

I am using Calendar & CalendarA in DhtmlGrid ProV1.5. After l call myrid.attachfooter(), I find calendar popup window is hided under browser is IE7.

Any Suggestion?

Best Regards


Add next line in dhtmlxcalendar.css

background: url(imgs/cal_bg_single.png) no-repeat;
border: 0px solid green;
font-family: Arial;
z-index:99; //<< need to be added or increased