public FormItemCollection() { InitializeComponent(); buttonNewColumn.Click += (sender, e) => AddItem.RaiseEventEx(this); addColumnToolStripMenuItem.Click += (sender, e) => AddItem.RaiseEventEx(this); removeColumnToolStripMenuItem.Click += (sender, e) => RemoveItem.RaiseEventEx(this); listBoxItems.SelectedIndexChanged += (sender, e) => SelectedItemChanged.RaiseEventEx(this); }