Xamarin.iOS adding button programmatically to UITableViewCell- nothing happens when clicking it - xamarin.ios

Question

I am trying to learn how to add uiviews programmatically to my UITableViewCell. I know I can add it through the storyboard but I need it to be programmatically.
For testing I have added below code. When I click on the button nothing happens, my test method is never called. What am I missing?
var cell = tableView.DequeueReusableCell(CellIdentifier) as TestCell;
var cellWidth = cell.Frame.Width;
var cellheight = cell.Frame.Height;
UIButton testing = new UIButton();
testing.SetTitle("TestBtn", UIControlState.Normal);
testing.Frame = new CGRect(0, 0, cellWidth, cellheight);
testing.BackgroundColor = UIColor.Green;
testing.TouchUpInside += (sender, e) => { test(); };
testing.UserInteractionEnabled = true;
cell.AddSubview(testing);
return cell;

Answer 1

The key is that the controls should be added on Cell.ContentView.Please refer to my below code in ViewController:
protected ViewController(IntPtr handle) : base(handle) { }
public override void ViewDidLoad()
{
base.ViewDidLoad();
UITableView _tableView = new UITableView(View.Bounds);
string[] data = new string[] { "test1", "test2", "test3" };
_tableView.DataSource = new CustomCellDataSource();
this.View.AddSubview(_tableView);
}
public override void DidReceiveMemoryWarning()
{
base.DidReceiveMemoryWarning();
}
public class CustomCellDataSource : UITableViewDataSource
{
public override UITableViewCell GetCell(UITableView tableView, NSIndexPath indexPath)
{
var cell = tableView.DequeueReusableCell("111");
if(cell == null)
{
cell = new UITableViewCell(UITableViewCellStyle.Default,"111");
cell.BackgroundColor = UIColor.Green;
}
UIButton testing = new UIButton(UIButtonType.System);
testing.SetTitle("TestBtn", UIControlState.Normal);
testing.BackgroundColor = UIColor.Red;
nfloat w = cell.Frame.Width;
nfloat h = cell.Frame.Height;
testing.Frame = new CoreGraphics.CGRect(0, 0, w, h);
cell.ContentView.AddSubview(testing);
return cell;
}
public override nint RowsInSection(UITableView tableView, nint section)
{
return 4;
}
}
public class CustomCellDelegate: UITableViewDelegate
{
[Export("tableView:heightForRowAtIndexPath:")]
public nfloat GetHeightForRow(UITableView tableView, NSIndexPath indexPath)
{
return 40;
}
}
Reference link.