How to set the blinking cursor to WPF Editable ComboBox?

Question

In my WPF program I have a standard ComboBox (Editable). My desired behavior is that upon FormLoad, I would like the user to be able to type into the ComboBox and select from the list. (At FormLoad I've already populated it with some strings.) So I set comboBox.Focus(), and since I have IsTextSearchEnabled="True", which is the default behavior, this works fine.

My problem is, when comboBox.Focus() is set, it does indeed focuses the control, but I do not get the blinking cursor inside it. This is what it looks like:

This in theory gets the job done, but I believe it's not very user-friendly. I would like the ComboBox to be focused, and also have the blinking cursor.

I get the blinking cursor when I click on the editable ComboBox, so I looked up what event gets fired when I do that. Turns out it's PreviewMouseLeftButtonDown, so I tried programmatically firing this event (although this is something I usually try to avoid) to see if that will be an option. This is my code:

comboBox.RaiseEvent
(
    new MouseButtonEventArgs
    (
        Mouse.PrimaryDevice, 
        Environment.TickCount, 
        MouseButton.Left
    ) 
    { 
        RoutedEvent = PreviewMouseLeftButtonDownEvent 
    }
);

I used a Console.WriteLine() to print a simple message to verify in Output Window if the event gets fired, and indeed it does. However, I still do NOT get the blinking cursor in my ComboBox.

Then I looked through SO, and found this question and the OP's edited fix seems to work. However this seems like quite a bit round-about way to get a seemingly simple task done, so I'm wondering if there's a rather straightforward or simpler way that I can achieve the desired result.

Answer 1

Calling the Focus() method once the window has loaded seems to work just fine for me:

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
        DataContext = this;
        this.Loaded += (s,e) => comboBox.Focus();
     }
}

If it doesn't work for you, then please provide a reproducible sample of your issue: https://stackoverflow.com/help/mcve