Struggling with Tag gesture and Command Parameters

The following is a snippet from my XAML:
<ListView.ItemTemplate>




<Grid.RowDefinitions>

</Grid.RowDefinitions>
<Grid.ColumnDefinitions>


</Grid.ColumnDefinitions>


<Label.GestureRecognizers>

</Label.GestureRecognizers>

                            </Grid>
                        </StackLayout>
                    </ViewCell>
                </DataTemplate>

            </ListView.ItemTemplate>

Basically, I am adding a trash can icon on every row and Binding the method DeleteCommand passing the parameter of the object on that row (which is actually a class for AddressType.

In my ViewModel, the following is where I wire up the commands. Snippet:
void DeleteCommandExecute(AddressType address)
{
if (IsBusy)
return;
IsBusy = true;

        try
        {
            DataStore.DeleteAddressTypeAsync(address.Id);
        }
        catch (Exception ex)
        {
            Debug.WriteLine(ex);
        }
        finally
        {
            IsBusy = false;
        }
    }

In my codebehind file, I set the BindingContext to the viewmodel
private AddressTypeViewModel viewModel;
public AddressTypes()
{
InitializeComponent();
BindingContext = viewModel = new AddressTypeViewModel();
stack = Addresspopup.PopupView.ContentTemplate.CreateContent() as StackLayout;

    }

The DeleteCommand never executes. It appears no binding occured (even though the {Binding AddressTypeName} works as expected.

I have no idea why.

I also tried just catching the Tap event in my code behind by doing this in my XAML:

<Label.GestureRecognizers>

</Label.GestureRecognizers>

I added this to my code behind:
public void OnDelete_Tapped(object sender, EventArgs e)
{
viewModel.DeleteCommand.Execute(e); //deletes the item

        viewModel.LoadAddressTypesCommand.Execute(true); //reload the addresstypes
    }

The DeleteCommand does NOT execute! I put a breakpoint in that method in my view model - nothing happens - never hits it.

Can someone shed any light on this? Thanks in advance!