Devex Popupcontrol content not displayed in Firefox

I am trying to use Devexpress popup control in a asp.net's repeater control to show full size image of the product.

It works perfectly in IE but image is not being displayed in Firefox and Chrome. I have tried to use same code as in http://demos.devexpress.com/aspxperiencedemos/popupcontrol/Features.aspx but still no success.

One difference I have noticed is that in my page popup control has an empty iframe while on devex's page there is no iframe. I could not f开发者_StackOverflowind a property to control this thing.

I am using trial version of Devex 10.2.8.0.