Different template for items in ComboBox's drop-down list and for selected item

Question

I have a ComboBox with fairly complex template for individual items, which includes two images and several lines of text:

Answer 1

I was searching for a standard (not hacky and without binding errors) solution to this problem. And I found it here: using DataTemplateSelector.

It's the same idea as per @H.B. answer: check whenever there is a ComboBoxItem as a parent in visual tree.

public class ComboBoxItemTemplateSelector : DataTemplateSelector
{
    public DataTemplate SelectedTemplate { get; set; }
    public DataTemplate DropDownTemplate { get; set; }

    public override DataTemplate SelectTemplate(object item, DependencyObject container)
    {
        while (container != null)
        {
            container = VisualTreeHelper.GetParent(container);
            if (container is ComboBoxItem)
                return DropDownTemplate;
        }
        return SelectedTemplate;
    }
}

Usage:

    
        
            
                ... simple template for selected item
            
        
        
            
                ... complex template used by dropdown items