I use Fluent:ToggleButton (v1.3) in group in my project. UseAutoCheck property helps me to operate checked/unchacked states manually in codebehind.
After upgrading to v2.0 I'm not be able to do it, because cannot find similar property.
Also couldn't find it in System.Windows.Controls.Primitives.ToggleButton.
Could you help me which property can I use instead of UseAutoCheck?