PO/Library/PackageCache/com.unity.timeline@1.4.8/Editor/Signals/SignalReceiverHeader.cs

using UnityEditor.IMGUI.Controls;
using UnityEngine;

namespace UnityEditor.Timeline.Signals
{
    class SignalReceiverHeader : MultiColumnHeader
    {
        public SignalReceiverHeader(MultiColumnHeaderState state) : base(state) {}

        protected override void AddColumnHeaderContextMenuItems(GenericMenu menu)
        {
            menu.AddItem(EditorGUIUtility.TrTextContent("Resize to Fit"), false, ResizeToFit);
        }
    }
}