databinding-listitem-command.cs

// http://forums.xamarin.com/discussion/comment/144204/#Comment_144204
// Projects is an ObservableCollection

<ListView x:Name="projectListView"
          ItemsSource="{Binding Projects}"
          SelectedItem="{Binding SelectedProject, Mode=TwoWay}">
        <ListView.ItemTemplate>
            <DataTemplate>
                <TextCell x:Name="textCell"
                          Text="{Binding Name}"
                          Detail="{Binding LastTestRun}">
                    <TextCell.ContextActions>
                        <MenuItem Text="Edit" 
                                  BindingContext="{Binding Source={x:Reference projectListView}, Path=BindingContext}" 
                                  Command="{Binding EditProject}" 
                                  CommandParameter="{Binding Source={x:Reference textCell}, Path=BindingContext}" /> 
                    </TextCell.ContextActions>
                </TextCell>
            </DataTemplate>
        </ListView.ItemTemplate>
    </ListView>