How to make in main menu?

If you mean you select a them by name and it'll load that them then you:

you have a drop down menu of theme names. Once you select the theme it'll load the theme. Think of it like this a theme is a GUI, you can make custom GUI and use them by coding. Basically you making it so that when you click the text it'll display the GUI attached to that piece of code. I would give you some code, but you need to learn by your self. Sorry.

This is script i use for my main menu page... not 100% if this is what you asking for...

using UnityEngine; using System.Collections;

public class Menu : MonoBehaviour { public GUISkin guiSkin; public Texture2D background, LOGO; public bool DragWindow = false; public string levelToLoadWhenClickedPlay = ""; public string[] AboutTextLines = new string[0];

 private string clicked = "", MessageDisplayOnAbout = "About \n ";
 private Rect WindowRect = new Rect((Screen.width / 2) - 100, Screen.height / 2, 200, 150);
 private float volume = 1.0f;

 private void Start()
 {
     for (int x = 0; x < AboutTextLines.Length;x++ )
     {
         MessageDisplayOnAbout += AboutTextLines[x] + " \n ";
     }
     MessageDisplayOnAbout += "Press Esc To Go Back";
 }

 private void OnGUI()
 {
     if (background != null)
         GUI.DrawTexture(new Rect(0,0,Screen.width , Screen.height),background);
     if (LOGO != null && clicked != "about")
         GUI.DrawTexture(new Rect((Screen.width / 2) - 440, 150, 900, 350), LOGO);

     GUI.skin = guiSkin;
     if (clicked == "")
     {
         WindowRect = GUI.Window(0, WindowRect, menuFunc, "Main Menu");
     }
     else if (clicked == "options")
     {
         WindowRect = GUI.Window(1, WindowRect, optionsFunc, "Options");
     }
     else if (clicked == "about")
     {
         GUI.Box(new Rect (0,0,Screen.width,Screen.height), MessageDisplayOnAbout);
     }else if (clicked == "resolution")
     {
         GUILayout.BeginVertical();
         for (int x = 0; x < Screen.resolutions.Length;x++ )
         {
             if (GUILayout.Button(Screen.resolutions[x].width + "X" + Screen.resolutions[x].height))
             {
                 Screen.SetResolution(Screen.resolutions[x].width,Screen.resolutions[x].height,true);
             }
         }
         GUILayout.EndVertical();
         GUILayout.BeginHorizontal();
         if (GUILayout.Button("Back"))
         {
             clicked = "options";
         }
         GUILayout.EndHorizontal();
     }
 }

 private void optionsFunc(int id)
 {
     if (GUILayout.Button("Resolution"))
     {
         clicked = "resolution";
     }
     GUILayout.Box("Volume");
     volume = GUILayout.HorizontalSlider(volume ,0.0f,1.0f);
     AudioListener.volume = volume;
     if (GUILayout.Button("Back"))
     {
         clicked = "";
     }
     if (DragWindow)
         GUI.DragWindow(new Rect (0,0,Screen.width,Screen.height));
 }

 private void menuFunc(int id)
 {
     //buttons 
     if (GUILayout.Button("Play Game"))
     {
         //play game is clicked
         Application.LoadLevel(levelToLoadWhenClickedPlay);
     }
     if (GUILayout.Button("Options"))
     {
         clicked = "options";
     }
     if (GUILayout.Button("About"))
     {
         clicked = "about";
     }
     if (GUILayout.Button("Quit Game"))
     {
         Application.Quit();
     }
     if (DragWindow)
         GUI.DragWindow(new Rect(0, 0, Screen.width, Screen.height));
 }

 private void Update()
 {
     if (clicked == "about" && Input.GetKey (KeyCode.Escape))
         clicked = "";
 }

}

`Blockquote`

You can make your life easy if you download the NGUI package from the Unity Assests store. It is fast and easy to make menues and things of that nature.

Maybe GUI?

 var isMenu : boolean;
 
 function OnGUI () {
      if (GUI.Button (Rect (0, 0, 100, 100), "Menu")) {
           isMenu = !isMenu;
      }
      if (isMenu) {
           if (GUI.Button (Rect (150, 150, 100, 100), "Quit")) {
                Application.LoadLevel("//");
           }
      }
 }

I think this is what you are talking about. If it isn't, let me know.

Hope this helps.

This is script i use for my main menu page... not 100% if this is what you asking for...

using UnityEngine; using System.Collections;

public class Menu : MonoBehaviour { public GUISkin guiSkin; public Texture2D background, LOGO; public bool DragWindow = false; public string levelToLoadWhenClickedPlay = ""; public string[] AboutTextLines = new string[0];

 private string clicked = "", MessageDisplayOnAbout = "About \n ";
 private Rect WindowRect = new Rect((Screen.width / 2) - 100, Screen.height / 2, 200, 150);
 private float volume = 1.0f;

 private void Start()
 {
     for (int x = 0; x < AboutTextLines.Length;x++ )
     {
         MessageDisplayOnAbout += AboutTextLines[x] + " \n ";
     }
     MessageDisplayOnAbout += "Press Esc To Go Back";
 }

 private void OnGUI()
 {
     if (background != null)
         GUI.DrawTexture(new Rect(0,0,Screen.width , Screen.height),background);
     if (LOGO != null && clicked != "about")
         GUI.DrawTexture(new Rect((Screen.width / 2) - 440, 150, 900, 350), LOGO);

     GUI.skin = guiSkin;
     if (clicked == "")
     {
         WindowRect = GUI.Window(0, WindowRect, menuFunc, "Main Menu");
     }
     else if (clicked == "options")
     {
         WindowRect = GUI.Window(1, WindowRect, optionsFunc, "Options");
     }
     else if (clicked == "about")
     {
         GUI.Box(new Rect (0,0,Screen.width,Screen.height), MessageDisplayOnAbout);
     }else if (clicked == "resolution")
     {
         GUILayout.BeginVertical();
         for (int x = 0; x < Screen.resolutions.Length;x++ )
         {
             if (GUILayout.Button(Screen.resolutions[x].width + "X" + Screen.resolutions[x].height))
             {
                 Screen.SetResolution(Screen.resolutions[x].width,Screen.resolutions[x].height,true);
             }
         }
         GUILayout.EndVertical();
         GUILayout.BeginHorizontal();
         if (GUILayout.Button("Back"))
         {
             clicked = "options";
         }
         GUILayout.EndHorizontal();
     }
 }

 private void optionsFunc(int id)
 {
     if (GUILayout.Button("Resolution"))
     {
         clicked = "resolution";
     }
     GUILayout.Box("Volume");
     volume = GUILayout.HorizontalSlider(volume ,0.0f,1.0f);
     AudioListener.volume = volume;
     if (GUILayout.Button("Back"))
     {
         clicked = "";
     }
     if (DragWindow)
         GUI.DragWindow(new Rect (0,0,Screen.width,Screen.height));
 }

 private void menuFunc(int id)
 {
     //buttons 
     if (GUILayout.Button("Play Game"))
     {
         //play game is clicked
         Application.LoadLevel(levelToLoadWhenClickedPlay);
     }
     if (GUILayout.Button("Options"))
     {
         clicked = "options";
     }
     if (GUILayout.Button("About"))
     {
         clicked = "about";
     }
     if (GUILayout.Button("Quit Game"))
     {
         Application.Quit();
     }
     if (DragWindow)
         GUI.DragWindow(new Rect(0, 0, Screen.width, Screen.height));
 }

 private void Update()
 {
     if (clicked == "about" && Input.GetKey (KeyCode.Escape))
         clicked = "";
 }

}