private async void ImageTap(object obj)
{
ActionSheetConfig config = new ActionSheetConfig();
config.SetUseBottomSheet(true);
var galeryIcon = await BitmapLoader.Current.LoadFromResource("ic_collections.png", 500f, 500f);
var photoIcon = await BitmapLoader.Current.LoadFromResource("ic_camera_alt.png", 500f, 500f);
config.Add("Take Picture From Galery", SetPictureFromGalery, galeryIcon);
config.Add("Take Picture From Camera", SetFromCamera, photoIcon);
config.SetCancel(null, null, null);
_userDialogs.ActionSheet(config);
}