using Avalonia.Collections; using Avalonia.Controls; using Avalonia.Markup.Xaml; using Editopia.Editor.Pages; using System; using System.Collections; using System.Collections.Generic; namespace Editopia.Editor { public class MainView : UserControl { public MainView() { this.InitializeComponent(); } private void InitializeComponent() { AvaloniaXamlLoader.Load(this); IList tabItems = ((IList)this.FindControl("Sidebar").Items); tabItems.Add(new TabItem() { Header = "Trainer Page", Content = new EditTrainer() }); } } }