Commented Issue: ChildWindow used with theme leads to InvalidOperationException [4752]

My main UserControl is themed, so that the theme applies to all controls.

Now I want to open a ChildWindow:

ChildWindow w = new ChildWindow();
w.Show();

I get following exception:

A first chance exception of type 'System.InvalidOperationException' occurred in System.Windows.dll
[Main Thread] FATAL Unhandled exception Exception=Cannot resolve TargetName DisabledVisualElement. StackTrace= at MS.Internal.XcpImports.VisualStateManager_GoToState(Control reference, String StateName, Boolean useTransitions)
at System.Windows.VisualStateManager.GoToState(Control control, String stateName, Boolean useTransitions)
at System.Windows.Controls.Control.GoToState(Boolean useTransitions, String stateName)
at System.Windows.Controls.Primitives.ToggleButton.ChangeVisualState(Boolean useTransitions)
at System.Windows.Controls.Primitives.ButtonBase.UpdateVisualState(Boolean useTransitions)
at System.Windows.Controls.Primitives.ButtonBase.UpdateVisualState()
at System.Windows.Controls.Primitives.ButtonBase.OnIsEnabledChanged(IsEnabledChangedEventArgs e)
at System.Windows.Controls.Control.OnIsEnabledChanged(Control control, EventArgs args)
at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, String eventName)

Note that I don't set IsEnabled to false.
Comments: ** Comment from web user: devi_ous **

while it not fixed, you can mute exception in Application_UnhandledException handler(App.xaml.cs):

if (e.ExceptionObject.Message.Equals("Cannot resolve TargetName Root."))
{
e.Handled = true;
return;
}