CustomTransformInspector.AlignmentInspector

    private void AlignmentInspector()
    {
        EditorGUILayout.LabelField("Alignment", EditorStyles.boldLabel, layoutMaxWidth);
        alignTo = (AlignToType)EditorGUILayout.EnumPopup("Align to", alignTo, layoutMaxWidth);
        alignmentAxis = (AxisFlag)EditorGUILayout.EnumMaskField("Axis", alignmentAxis, layoutMaxWidth);

        string buttonLabel = "Select another object to align to";
        bool enableButton = false;
        Transform[] selectedTransforms = Selection.transforms;
        if (selectedTransforms.Length > 1)
        {
            if (alignTo == AlignToType.lastSelected)
            {
                buttonLabel = "Align to " + selectedTransforms[selectedTransforms.Length - 1].name;
            }
            else
            {
                buttonLabel = "Align to " + selectedTransforms[0].name;
            }
            enableButton = true;
        }

        GUI.enabled = enableButton;
        if (Button(buttonLabel))
        {
            AlignTo(alignTo, alignmentAxis);
        }
        GUI.enabled = true;
    }