void ReferenceTimeGUI()
{
EditorGUI.BeginChangeCheck();
var rect = EditorGUILayout.GetControlRect(false, EditorGUI.kSingleLineHeight, EditorStyles.toolbarButton, GUILayout.Width(WindowConstants.refTimeWidth));
state.timeReferenceMode = (TimeReferenceMode)EditorGUI.CycleButton(rect, (int)state.timeReferenceMode, k_TimeReferenceGUIContents, EditorStyles.toolbarButton);
if (EditorGUI.EndChangeCheck())
{
OnTimeReferenceModeChanged();
}
}