// Modifies only the window style of the current GUISkin

var style : GUIStyle;
var windowRect : Rect = Rect (20, 20, 120, 50);

function OnGUI() {
GUI.skin.window = style;
windowRect = GUILayout.Window (0, windowRect, DoMyWindow, "My Window");
}

// Make the contents of the window
function DoMyWindow (windowID : int) {
// This button will size to fit the window
if (GUILayout.Button ("Hello World"))
print ("Got a click");
}

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
public GUIStyle style;
public Rect windowRect = new Rect(20, 20, 120, 50);
void OnGUI() {
GUI.skin.window = style;
windowRect = GUILayout.Window(0, windowRect, DoMyWindow, "My Window");
}
void DoMyWindow(int windowID) {
if (GUILayout.Button("Hello World"))
print("Got a click");

}
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

public style as GUIStyle

public windowRect as Rect = Rect(20, 20, 120, 50)

def OnGUI():
GUI.skin.window = style
windowRect = GUILayout.Window(0, windowRect, DoMyWindow, 'My Window')

def DoMyWindow(windowID as int):
if GUILayout.Button('Hello World'):
print('Got a click')