SwitchManager.cs

public class SwitchManager
{
	public static void InitializeAgentWindow(AgentWindow type)
        {
            Dictionary<int, AgentWindow> temp = new Dictionary<int, AgentWindow>();
            if (agentWindows.Count == 0)
                agentWindows.Add(1, type);
            else
            {
                temp.Add(1, type);
                foreach (var window in agentWindows)
                {
                    var t = window.Key;
                    temp.Add(++t, window.Value);
                }

                agentWindows = temp;
            }
        }

    public static int SwitchToAgent(AgentWindow type)
        {
            var windowToSwitch = agentWindows.First(w => w.Value == type);
            UpdateIndexesAgent(windowToSwitch);

            return windowToSwitch.Key;
        }

    private static void UpdateIndexesAgent(KeyValuePair<int, AgentWindow> windowToSwitch)
        {
            Dictionary<int, AgentWindow> temp = new Dictionary<int, AgentWindow>();

            agentWindows.Remove(windowToSwitch.Key);

            foreach (var window in agentWindows)
            {
                if (window.Key < windowToSwitch.Key)
                {
                    var t = window.Key;
                    temp.Add(++t, window.Value);
                }
                else
                    temp.Add(window.Key, window.Value);
            }
            temp.Add(1, windowToSwitch.Value);

            agentWindows = temp;
        }
	

    private static Dictionary<int, AgentWindow> agentWindows = new Dictionary<int, AgentWindow>();
}

public enum AgentWindow
{
    AgentA1,
    AgentA2,
    AgentF1
}