in ios, is there way to bind command to checkbox?  I want to select item when checkbox is tapped when SelectionGesture is hold.

Hello Jay,

Due to the fact that not every platform uses checkboxes, we don't have an external property for you to directly hook into the checkbox. You can modify the items in the SelectedItems collection (adding an item to the collection will show it as checked and vice versa).

You can use Xamarin EventToCommand behavior binding for ItemTapped and ItemHold events. See the RadListView Events documentation for more details. 

An alternative option to using events is the RadListView's commands collection. However, there isn't yet a Commands article in the documentation. I've logged this in our backlog, you can up-vote and follow in in the Feedback Portal using this link: Add Commands Documentation. You can follow the DataGrid Commands article for initial guidance as they're the same approach, but has different command IDs.

Regards,
Lance | Tech Support Engineer, Sr.
Progress Telerik