Destroy OnGUI ()

Unity Engine
1

How can I get the last button in this code to disappear after say… 5-10 seconds? I tried yield and destroy(this), but they didn’t work:

function OnGUI()
{
	if (npctrigger)
	{
	//GUI.BeginGroup (Rect (Screen.width / 2 - 50, Screen.height / 2 - 50, 100, 100));
	
	if (yesbutton)
	{
		GUI.Box (Rect(0, 0, 100, 100), "Enter treasure chest");
	}
	else if (nobutton)
	{
		GUI.Box (Rect(0, 0, 100, 100), "You cannot enter");
	}
	else
	{
		GUI.Box (Rect(0, 0, 100, 100), "Give inventory?");
		if (GUI.Button (Rect(25, 25, 50, 30), "Yes"))
		{
			yesbutton = true;
			Debug.Log("True");
		}

		if (GUI.Button (Rect(25, 65, 50, 30), "No"))
		{
			nobutton  = true;
			Debug.Log("No");
		}
	}
	
	//GUI.EndGroup ();
	}
}
2

Just have a boolean like all your others… Make it switch after 5 seconds. Put the button into an if{ } block…