public DropDownView (string Title, IList<string> data, nfloat fSize, 
			nfloat cellHeight, float layoutHeight, UIColor cellSelectedBackgroundColor, UIColor cellSelectedTextColor,
			UIColor borderColor)
		{
			BorderColor = borderColor;
			NSNotificationCenter.DefaultCenter.AddObserver(UIDevice.OrientationDidChangeNotification, OrientationChanged);
			this.Title = Title;
			this._CellHeight = cellHeight;
			this.IsShowing = false;

			this.ControlHeight = layoutHeight;
			this._DropDownControl = new DropDownControl (this, fSize);

			this._TblView = new DropDownTable (data, cellHeight, fSize, cellSelectedBackgroundColor, cellSelectedTextColor);

			// DropDown PopupView
			this._MainView = new UIView ();
			this._MainView.Layer.MasksToBounds = false;
			this._MainView.Layer.BorderColor = this.BorderColor.CGColor;
			this._MainView.Layer.BorderWidth = 1;

			_MainView.UserInteractionEnabled = true;
			this._MainView.UserInteractionEnabled = true;
			this.MultipleTouchEnabled = true;
			this._TblView.MultipleTouchEnabled = true;

			// add DropDownControl
			Add(this._DropDownControl);

			if (this._IsXamarinForms == false) {
				this.Add (this._MainView);
			}

			_MainView.Add (_TblView);
			_MainView.Hidden = true;



			// handle selected Text
			this._TblView.SelectedText = (x) => {
				this._SelectedText = x;
				this._DropDownControl.SelectedText(x);
				if (SelectedText != null)
				{
					SelectedText(x);
				}
				HideDropDown();
			};
		}
		public DropDownView (string Title, IList<string> data, nfloat fSize, 
			nint cellHeight, float layoutHeight, UIColor cellSelectedBackgroundColor, UIColor cellSelectedTextColor,
			UIColor borderColor, 
			string iOSTitle = "",
			string selectedText = "")
		{
			_Values = new DropDownConstants ();
			_Values.HeaderHeight = 20;
			_Values.HeaderFontHeight = 12;

			BorderColor = borderColor;
			NSNotificationCenter.DefaultCenter.AddObserver(UIDevice.OrientationDidChangeNotification, OrientationChanged);
			this.Title = Title;
			this._CellHeight = cellHeight;
			this._IsShowing = false;

			this.ControlHeight = layoutHeight;
			this._DropDownControl = new DropDownControl (this, fSize);

			this._TblView = new DropDownTable (data, cellHeight, fSize, cellSelectedBackgroundColor, cellSelectedTextColor, selectedText);

			this._OverLayView = new UIView ();

			// DropDown PopupView
			this._MainView = new UIView ();
			this._MainView.Layer.MasksToBounds = false;
			this._MainView.Layer.BorderColor = this.BorderColor.CGColor;
			this._MainView.Layer.BorderWidth = this._Values.BorderWidth;

			_MainView.UserInteractionEnabled = true;
			this._MainView.UserInteractionEnabled = true;
			this.MultipleTouchEnabled = true;
			this._TblView.MultipleTouchEnabled = true;


			this._HeaderView = new DropDownViewHeader (this, iOSTitle);

			// add DropDownControl
			Add(this._DropDownControl);

			if (this._IsXamarinForms == false) {
				//this.Add (this._MainView);
			}

			this._OverLayView.Add (this._MainView);
			this._Tap = new UITapGestureRecognizer (() => {
				HideDropDown();
			});

			this._Tap.ShouldReceiveTouch = (recognizer, touch) => {
				var view = UIApplication.SharedApplication.KeyWindow.RootViewController.View;
				var pos = touch.LocationInView(view);

				var f = this._MainView.Frame;
				if(f.Contains(pos) == false)
				{
					return true;
				}

				return false;
			};
			// hide if tapped
			this._OverLayView.AddGestureRecognizer(this._Tap);

			_MainView.Add (this._HeaderView);
			_MainView.AddSubview (_TblView);
			_OverLayView.Hidden = true;

			//AddSubview (this.overlay);

			var w = UIApplication.SharedApplication.KeyWindow;
			var v = w.RootViewController.View;
			v.Add (this._OverLayView);

			// handle selected Text
			this._TblView.SelectedText = (x) => {
				this._SelectedText = x;
				this._DropDownControl.SelectedText(x);
				if (SelectedText != null)
				{
					SelectedText(x);
				}
				HideDropDown();
			};
		}