Set Cursor Focus into Editable Combobox in WPF C#

Question

I have editable combobox in WPF and I want to set focus from C#,

I am using Combobox.Focus(), but it shows only selection but I want edit option where user can star

Answer 1

Try Creating a Focus Extension like below, and set the attached property to the text box and bind it.

public static class FocusExtension
{
    public static bool GetIsFocused(DependencyObject obj)
    {
        return (bool)obj.GetValue(IsFocusedProperty);
    }


    public static void SetIsFocused(DependencyObject obj, bool value)
    {
        obj.SetValue(IsFocusedProperty, value);
    }


    public static readonly DependencyProperty IsFocusedProperty =
        DependencyProperty.RegisterAttached(
         "IsFocused", typeof(bool), typeof(FocusExtension),
         new UIPropertyMetadata(false, OnIsFocusedPropertyChanged));


    private static void OnIsFocusedPropertyChanged(DependencyObject d,
        DependencyPropertyChangedEventArgs e)
    {
        var uie = (UIElement)d;
        if ((bool)e.NewValue)
        {
            OnLostFocus(uie, null);
            uie.Focus();
        }
    }

    private static void OnLostFocus(object sender, RoutedEventArgs e)
    {
        if (sender != null && sender is UIElement)
        {
            (sender as UIElement).SetValue(IsFocusedProperty, false);
        }
    }
}

XAML