static public void OpenNGUIChecker()
{
FolderBatchOperateTool window = EditorWindow.GetWindow <FolderBatchOperateTool>(false, "Folder Tool");
window.minSize = window.maxSize = new Vector2(DefaultWidth, DefaultHeight);
window.Show();
}
void OnDisable()
{
instance = null;
}
void OnEnable()
{
instance = this;
}