【Unity3d】GUI 点击出窗口

var WindowSwitch : boolean;
var windowRect : Rect = Rect(20, 40, 200, 100);
//点击出窗口
function OnGUI ()
 {
   if(WindowSwitch)
   {
  windowRect = GUI.Window (0, windowRect, WindowFunction, "wayne");
   }
}

function WindowFunction (windowID : int)
{
    if (GUI.Button (Rect (40,40,160,20), "close window"))
   {
      WindowSwitch = false;
   }
}

function OnMouseEnter ()
 {
    renderer.material.color = Color.blue;
}

function OnMouseDown ()
{
   WindowSwitch = true;
}

function OnMouseExit ()
{
   renderer.material.color = Color.white;
}