Hi Manjula,
Thanks for using Syncfusion products.
We have created a sample to set custom resource string for New Horizontal and New Vertical Tab Groups in Docking Manager which you can download under the following location.
Sample Link:
http://www.syncfusion.com/downloads/Support/DirectTrac/90627/F102786_DM_ResourceString-975897771.zip In this sample, we have embedded the local resource file “Syncfusion.Tools.Wpf.resx” to customize the resource string. We have set the customized values for the “NewHorizontalTabGroup” and “NewVerticalTabGroup” in the resource file to achieve your requirement.
Please let us know if the sample helps.
Regards,
Surya Narayana