Color Picker In Unity

Unity Engine
1

Hi All

How can i run the Editor Window file in unity. When i run the below file it shows the error mono behaviour is not there. So how can i run the below files.

public class Boxes : EditorWindow {
    [MenuItem( "Window/Boxes" )]
    static void Init () {
        Boxes window = (Boxes) EditorWindow.GetWindow( typeof( Boxes ) );
        window.Show();
        window.position = new Rect( 20, 80, 310, 300 );
    }
    void OnGUI () {
        GUILayout.Box( "Default Box" );
        GUI.color = Color.green;
        GUILayout.Box( "Green Box" );
        GUI.color = Color.red;
        GUILayout.Box( "Red Box" );
    }
}

Thanks in Advance

2

Do you have this script inside an Editor folder?