Hi Matt Gianino,
Thank you for contacting Syncfusion Support.
We were unable to reproduce the issue in TabControlExt. Could you please verify that assemblies "Syncfusion.Tools.WPF" and "Syncfusion.Shared.WPF" are added in your application? Also ensure that the TargetFramework version of your project and referred assemblies are the same. You can use 4.5.1 assemblies to set the target version 4.5.2 and please refer the assemblies folder from the below location.
Local Path: [local drive]:\Program Files (x86)\Syncfusion\Essential Studio\13.3.0.7\Assemblies\4.5.1
We have prepared the sample that tries to meet your requirement and you can download the same from the below location
Sample:
TabcontrolExtIf you still face the same issue, please update us with issue reproduced sample with locally referred assemblies. This would help us to proceed further.
Regards
Ashok Kumar M.