Hi Jean,
Sorry for the delay in getting back to you.
We are glad to inform you that our final release of 4.2(v4.2.0.37) is available for download. Here is the download link:
http://www.syncfusion.com/Downloads/latestversion.aspx
We have added
ImageSize property in tabbedMDIManager to set the size of the image or icons.
Please install this version and let me know if you still see the problem in this version.
Thanks for using Syncfusion products.
Best Regards,
Seetha