How can I create a button group like [Select|Revert|Apply] of the default game object?

Like this:

24385-buttongroup.jpg

Thanks in advance!

This should do:

EditorGUILayout.BeginHorizontal ();
if (GUILayout.Button ("Select", EditorStyles.miniButtonLeft)) {
}
if (GUILayout.Button ("Revert", EditorStyles.miniButton)) {
}
if (GUILayout.Button ("Apply", EditorStyles.miniButtonRight)) {
}
EditorGUILayout.EndHorizontal ();