GUISkin.window

설명

Style used by default for Window controls (SA GUI.Window).

using UnityEngine;
using System.Collections;

public class ExampleClass : 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");
        
    }
}