UI.GUILayout(this, new Window(new Rect(100, 100, 500, 500))
.ID("window")
.Title("Window Title")
.DragTitlebar()
.Skin(HighLogic.Skin)
.Content(new TabControl()
    .AddPage("Page 1",
        new VerticalPanel()
        .Add(new Button("A Button")
            .Tooltip("tooltip!")
                .Style(() => GUI.skin.textField).OK
            // This will print "A Button was clicked" on each click
            .OnClicked(s => print(s.Label() + " was clicked"))
            .Image(buttonIcon)
        )
        .Add(new PasswordField("Password")
            .ID("pw1")
            .Tooltip("Your secret's safe with me").OK
        )
        .Add(new Toggle("Checkbox 1")
            // Bind the value of the checkbox to the Option1 variable
            .IsChecked().BindTwoWay(() => Option1, v => Option1 = v)
            .OnToggled((source, old, nw) => print(source.Label() + " is now " + nw))
            // Binding to the visible property makes this control only visible
            // when Option1 is true, letting us show/hide it using the Toggle control below
            .Visible().BindOneWay(() => Option1)
        )
        .Add(new Toggle("Toggle hidden options")
            // Bind the value of the checkbox to the Option1 variable
            .IsChecked().BindTwoWay(() => Option1, v => Option1 = v)
            // Print to the console each time the value changes
            .OnToggled((source, old, nw) => print(source.Label() + " is now " + nw))
        )
        .Add(new Button("Unity skin")
            .OnClicked(s => ui.ByID<Window>("window").Skin(null))
            .Skin(null, true)
        )
        .Add(new Button("KSP skin")
            .OnClicked(s => ui.ByID<Window>("window").Skin(HighLogic.Skin))
            .Skin(HighLogic.Skin, true)
        )
        .Add(new HorizontalPanel()
            .Add(new TextField("0")
                .ID("sl1")
                .LayoutOptions(GUILayout.MaxWidth(50))
            )
            .Add(new HorizontalSlider(0, 50)
                .LayoutOptions(GUILayout.ExpandWidth(true))
                .Value().BindTwoWay(
                    () => ui.ByID<TextField>("sl1").Text().SafeToFloat(),
                    (v) => ui.ByID<TextField>("sl1").Text(v.ToString("0.00"))
                )
            )
        )
    )
    .AddPage("Page 2",
        new VerticalPanel()
        .Add(new Button("Another Button")
            .Image(buttonIcon)
        )
        .Add(new AutoSpace(50))
        .Add(new TextField("Text goes here"))
        .Add(new Toggle("Checkbox 1")
            .Visible().BindOneWay(() => Option1)
        )
    )
    .AddPage("Page 3",
        new ScrollView()
        .AlwaysShowHorizontal()
        .AlwaysShowVertical()
        .Add(new VerticalPanel()
            .ID("panel")
            .Add(new Button("This button adds controls")
                .OnClicked(src => ui.ByID<VerticalPanel>("panel").Add(
                        new Button("Hello!").OnClicked(s => s.ParentAs<VerticalPanel>().Remove(s))
                    ))
            )
        )
    )
    .AddPage("Page 4",
        new TextArea()
    )
)
.Title().BindOneWay(() => "title is " + ui.ByID<PasswordField>("pw1").Password())