Hi Nick,
I apologize for the delay in responding. However, while we try to answer forum posts quickly, a DirectTrac incident should be used when you require an immediate response.
Regarding your question, I have included links to documentation on UpdateUIMFCStyle.
Update Stlye Documentation
BarManager.UpdateUIMFCStyle
BarItem.UpdateUIOnAppIdle
XPToolBar.UpdateUIMFCStyle
Please let me know if you have any further questions on this topic.
Regards,
Gregory Austin
Syncfusion Inc.