Current User Control Name

If you are following mvvm design pattern there are such steps:
1. In your userControl model create a property and call it ControlId.
2. Add userControls to some variable: for example List or ConcurrentBag or whatever.
3. Bind this to your view(MainWIndow).
4. Implement Event on your MainWIndowViewModel to check for userControls.

Example:
YourUserControlModel.cs :

public int ControlId{get;set;}

Set somewhere this property.
Load your usercontrols in constructor like this:

public MainWindowViewModel()
{
    Controls.Add(new YourUserControl());
}

private readonly DeferrableObservableCollection<YourUserControl> Controls = new DeferrableObservableCollection<YourUserControl>();

Event to look for userControls:

void SomeName(object Sender, EventArgs e)
{
   foreach(var control in Controls)
   {
       if(control.ViewModel.Model.ControlId == 1) // checks, if collection has userControl with id 1. And so on for all controls
       
   }
}

Hope this helped you.
If you have questions feel free to ask.