public NComboBox(Shape shape)
     : base(shape)
 {
     mListItems = new NListItemCollection();
     mListItems.OnItemAdded+=new Netron.GraphLib.Utils.NListItemCollection.NListChange(mListItems_OnItemAdded);
     mListItems.OnItemRemoved+=new Netron.GraphLib.Utils.NListItemCollection.NListChange(mListItems_OnItemRemoved);
 }
 public NTextBox(Shape shape)
     : base(shape)
 {
     mListItems = new NListItemCollection();
     timer = new Timer();
     timer.Interval = 600;
     timer.Tick+=new EventHandler(timer_Tick);
 }
 public NComboBox(Shape shape, int width, int height)
     : base(shape)
 {
     this.mWidth = width;
     this.mHeight = height;
     mListItems = new NListItemCollection();
     mListItems.OnItemAdded+=new Netron.GraphLib.Utils.NListItemCollection.NListChange(mListItems_OnItemAdded);
     mListItems.OnItemRemoved+=new Netron.GraphLib.Utils.NListItemCollection.NListChange(mListItems_OnItemRemoved);
 }
 public NTextBox(Shape shape, int width, int height)
     : base(shape)
 {
     this.mWidth = width;
     this.mHeight = height;
     mListItems = new NListItemCollection();
     timer = new Timer();
     timer.Interval = 600;
     timer.Tick+=new EventHandler(timer_Tick);
 }