Fortigate SSL Webportal Issue

Hi Everyone wondering if anyone has come across this issue. I have created a Web Portal and created a new Connection to my internal server via RDP i can connect to the RDP session within the browser and works ok when using a Windows/Mac machine but when i connect with an ipad which is the requirement the RDP session connects ok but when u try and type something in the session the virtual keyboard does not come up on the ipad ... so i can type anything.Any suggestions? thanks heaps..