Unity editor panel with right-clickable button

SceneViewRightClickThingy.cs

[Overlay(typeof(SceneView), "SceneViewDemo", true)]
public class SceneViewDemo : Overlay {
    public override VisualElement CreatePanelContent() {
        VisualElement root = new() { name = "SceneViewDemo" };

        Button btn = new() {
            text = "Hello World";
        };
        btn.clickable.activators.Add(new() {
            button = MouseButton.RightMouse
        });
        btn.clickable.clickedWithEventInfo += eventBase => {
            if (eventBase is MouseUpEvent mouseUpEvent) {
                switch (mouseUpEvent.button) {
                    case 0:
                        // left click
                        break;
                    case 1:
                        // right click
                        break;
                }
            }
        };
        root.Add(btn);

        return root;
    }
}

The documentation for scene view panels is a little sparse and the UI toolkit buttons don't support right-clicking out of the box, so here's a code snippet to add a right-clickable button to a scene view panel and distinguish which mouse button was used. Tested in Unity 2022.