public static void LayerNamePopup(GUIContent label, SkillString variable, object obj = null, FieldInfo field = null)
 {
     SkillEditorGUILayout.PrefixLabel(label);
     if (GUILayout.Button(variable.get_Value(), EditorStyles.get_popup(), new GUILayoutOption[0]))
     {
         StringEditor.editingVariable = variable;
         StringEditor.editingObject   = obj;
         StringEditor.editingField    = field;
         StringEditor.DoLayerMenu();
     }
 }