C # WPF - ComboBox

Question

I am working on a custom control that internally uses a ComboBox.

My problem is that the ComboBox is focused and has a drop down list, it seems to focus the entire control. I would like to automatically select the first element in the stream, but now you need to press the Down key to do this.

Is there a way to programmatically highlight the first item in a ComboBox (set the readonly IsHighlighted property to true)? I believe that the IsHighlight concept inside the ComboBox is different from the Focus concept. Also, I am binding via ItemsSource, so I have no reference to ComboBoxItems.

Answer 1

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public MainWindow()
{
    InitializeComponent();
    combobox.ItemContainerGenerator.StatusChanged += new EventHandler(ItemContainerGenerator_StatusChanged);
}

void ItemContainerGenerator_StatusChanged(object sender, EventArgs e)
{
    if (combobox.ItemContainerGenerator.Status == System.Windows.Controls.Primitives.GeneratorStatus.ContainersGenerated)
    {
        (combobox.ItemContainerGenerator.ContainerFromIndex(0) as ComboBoxItem).Focus();
    }
}

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Answer 2

, , , mycombo.SelectedIndex = 0, mycombo.IsDropDownOpen = True, . , . , , ..