ItemTapped on HCollectionView iOS not working

[josco007]

Hi Iam using this code

             <ai:HCollectionView
                  x:Name="ParticipantsList"
                 TouchFeedbackColor="Black"
                SeparatorVisibility="None"
                ColumnWidth="300"
                HeightRequest="225"
                RelativeLayout.XConstraint="0"
                RelativeLayout.YConstraint="0"
                RelativeLayout.WidthConstraint="{ConstraintExpression 
                Type=RelativeToParent,Property=Width, Factor=1, Constant=0 }"
                RelativeLayout.HeightConstraint="{ConstraintExpression 
                Type=RelativeToParent,Property=Height, Factor=1, Constant=225 }"
                ItemTapped="ParticipantsList_ItemTapped"
                >

            <x:Arguments>
              <ListViewCachingStrategy>RecycleElement</ListViewCachingStrategy>
            </x:Arguments>

            <ListView.ItemTemplate>
              <DataTemplate>
                <ai:ContentCell>
                  <RelativeLayout Margin="0" >
                    <RelativeLayout>
                      <Image Source="shadow_rounded_border.png"
                             Aspect="Fill"
                             RelativeLayout.XConstraint="0"
                             RelativeLayout.YConstraint="0"
                             RelativeLayout.WidthConstraint="{ConstraintExpression Type=RelativeToParent, ElementName=SearchControlsGrid,Property=Width, Factor=1, Constant=0 }"
                             RelativeLayout.HeightConstraint="{ConstraintExpression Type=RelativeToParent, ElementName=SearchControlsGrid, Property=Height,Factor=1, Constant=0}"/>
  ...........

this ItemTapped="ParticipantsList_ItemTapped" is working well on andriod but on iOS not. the weird thing here is that in the simulator if I do the tap with the alt key pressed (pinch gesture) the event works!!!!