mono-examples: Use Del() to dispose of widgets

apps/csharp/life/src/life_board.cs

@@ -143,8 +143,7 @@ public class LifeBoard
     {
         if (lifeTimer != null)
         {
-            lifeTimer.SetParent(null);
-            lifeTimer.Dispose();
+            lifeTimer.Del();
             lifeTimer = null;
         }
         else

apps/csharp/texteditor/src/texteditor_main.cs

@@ -66,7 +66,7 @@ public class TextEditor : Efl.Csharp.Application
         popup.ButtonClickedEvent +=
             (object sender, Efl.Ui.AlertPopupButtonClickedEventArgs ea) => {
           // Dismiss popup when the button is clicked
-          ((Efl.Ui.AlertPopup)sender).SetParent(null);
+          ((Efl.Ui.AlertPopup)sender).Del();
         };
     }
 

unsorted/elementary/efl_ui_unit_converter.cs

@@ -24,8 +24,7 @@ public class Example
         popup.SetButton(Efl.Ui.Popup_Alert_Button.Positive, "Ok");
         popup.SetSize(new Eina.Size2D(150, 30));
         popup.ButtonClickedEvent += (object sender, Efl.Ui.Popup_Alert.ButtonClickedEventArgs e) => {
-            popup.SetParent(null);
-            popup.Invalidate();
+            popup.Del()
         };
     }