CustomTransformInspectorButton

    private GUILayoutOption[] buttonOptions = new GUILayoutOption[1] { GUILayout.Width(200f) };
    private bool Button(string label)
    {
        GUILayout.BeginHorizontal();
        GUILayout.FlexibleSpace();
        bool value = GUILayout.Button(label, buttonOptions);
        GUILayout.FlexibleSpace();
        GUILayout.EndHorizontal();
        return value;
    }