How to identify which element was double clicked inside a ListBox?

Question

I have a listbox. The listbox DataTemplate consists of few Text Blocks and some TextBoxes.

The issue

Answer 1

You can use FrameworkTemplate.FindName Method (String, FrameworkElement) for this purpose and it should works as you want:

private childItem FindVisualChild<childItem>(DependencyObject obj) where childItem : DependencyObject
{
    for (int i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++)
    {
        DependencyObject child = VisualTreeHelper.GetChild(obj, i);
        if (child != null && child is childItem)
            return (childItem)child;
        childItem childOfChild = FindVisualChild<childItem>(child);
        if (childOfChild != null)
            return childOfChild;
    }
    return null;
}

Then:

private void LstBox_OnPreviewMouseDoubleClick(object sender, MouseButtonEventArgs e)
{
    ListBoxItem ListBoxItem = (ListBoxItem)(lstBox.ItemContainerGenerator.ContainerFromIndex(lstBox.SelectedIndex));
    ContentPresenter contentPresenter = FindVisualChild<ContentPresenter>(ListBoxItem);
    DataTemplate myDataTemplate = contentPresenter.ContentTemplate;
    StackPanel temp = (StackPanel)myDataTemplate.FindName("myStackPanel", contentPresenter);
    //*so as to do some further operations like make the textbox editable and so on* as you want
   (temp.FindName("field1TextBox") as TextBox).IsReadOnly = false;
}

Based on your question that you said: The listbox's DataTemplate consists of few TextBlock and some TextBoxes. (I assumed they are inside a StackPanel)