Hi Pavendhan, Thanks for response
I still can reproduce the issue on your sample. Note that before I run your sample I have replaced the Xamarin Forms with new version 2.3.3.175. When I touch down and drag/scroll the dropdown it suddenly disappears and appears on touch up. My enviroment are following: Visual Studio 2015, Xamarin Forms 2.3.3.175, Syncfusion 14.445.0.15, iOS 10, iPhone 7 simulator
Thanks in advance
Khasan