Hello,

I downloaded the May Service Release for Winforms 13.1 and I am now getting an error from the UltraButton

System.NullReferenceException: Object reference not set to an instance of an object.    at Infragistics.Win.Misc.UltraButton.OnLostFocus(EventArgs e)

I've attached a sample project that reproduces the error in Visual Studio 2012.

The error occurs when I add a second Form to an ultraTabbedMdiManager.

Please Advise.  Thank You.