Hi Daniel,
Thank you for contacting Syncfusion Support.
We have checked your code example. In this, you have used SkinManager theme. The "Lime" theme is in SfSkinManager and VisualStyle is set to SfSkinManager Lime theme by the following steps.
1) Adding the Syncfusion.Themes.Lime.WPF and Syncfusion.SfSkinManager.WPF assemblies in References.
2) Include an xml namespace for the assembly to the Main window (xmlns:syncfusionskin="clr-namespace:Syncfusion.SfSkinManager;assembly=Syncfusion.SfSkinManager.WPF").
3) Set the VisualStyle as Lime(syncfusionskin:SfSkinManager.VisualStyle="Lime")
As mentioned in your previous update, you can refer the below documentation link for applying SfSkinManager themes.
Documentation Link:
http://help.syncfusion.com/wpf/themes/getting-started Regards,
Venkateshwaran V.R.