public override bool StartNotifyActionSheet(string title, string[] buttons, string[] javascriptCallBackFunctions) {
using (var pool = new NSAutoreleasePool ()) {
var thread = new Thread (ShowActionSheet);
ActionSheet sheet = new ActionSheet();
sheet.Title = title;
sheet.Buttons = buttons;
sheet.JsCallbackFunctions = javascriptCallBackFunctions;
thread.Start (sheet);
}
return true;
}