question

Hey

i try to describe the matter as following

<ControlTemplate x;TargetType="ComboBox">
<Grid>
<Image>
<Image.Source>
///Below this ControlTemplate nests a Template of type ComboBoxItem , if this ComboBox changes the selctedItem property, i
/// want to change the sopurce of this Image with the source property of the Image inside the ComboBocItem Template,,, for that i
/// have there applied an attachedproperty to can access the property
<Binding Source="{Binding to current selected items attached property (Excatlöy the syntax for such is me missing)"/>
</ImageSource>
</Image>
</>Grid>
</ControlTemplate>

<Style TargetType="ComboBoxItem">
<Setter Property="local:Namespace.AttachedProperty" Value="{x:Null"/>
<Setzter Property=ControlTemplate> <Setter.Value> <ControlTemplate TargetType="ComboBoxItem"> <Grid> //here the AttachedProperty is set in the ComboBox Template <Image Source="local:Namespace.AttachedProperty"/> <Label Content={TemplateBinding Content}"/> </Grid> </ControlTemplate> </Setter.Value> </Setter> </Style>

And then in the xaml design sheet:

<ComboBox>
<ComboBoxItem local:Namespace.AttachedProperty="URL"/>
<ComboBoxItem local:Namespace.AttachedProperty="URL"/>
<ComboBoxItem local:Namespace.AttachedProperty="URL"/>
</ComboBox>

Me in all is asking how to refer to the current selected item in the first ControlTemplate, if the user changes the item selected in the ComboBox the Source of the image also should changes,, i mean there directly the binding syntax to refer to the current selected item

You could try to refer to the code below.
MainWindow.xaml:

 <Window.DataContext>
         <local:ViewModel />
     </Window.DataContext>
    
     <StackPanel>
         <ComboBox SelectedItem="{Binding SelectedLangComboItem}" ItemsSource="{Binding Languages}">
             <ComboBox.ItemTemplate>
                 <DataTemplate>
                     <StackPanel Orientation="Horizontal">
                         <Image Source="{Binding Image}" />
                         <TextBlock Text="{Binding Label}" />
                     </StackPanel>
                 </DataTemplate>
             </ComboBox.ItemTemplate>
         </ComboBox>
     </StackPanel>

MainWindow.xaml.cs:

 using System.Collections.ObjectModel;
 using System.ComponentModel;
 using System.Runtime.CompilerServices;
 using System.Windows;
    
 namespace ComboboxTemplateDemo
 {
   public partial class MainWindow : Window
   {
     public MainWindow()
     {
       InitializeComponent();
     }
   }
   public class ViewModel : INotifyPropertyChanged
   {
     public ObservableCollection<LanguageItem> Languages{ get;set;}
     public ViewModel()
     {
       Languages = new ObservableCollection<LanguageItem>();
       Languages.Add(new LanguageItem("spring.jpg", "content1"));
       Languages.Add(new LanguageItem("spring1.jpg", "content2"));
       Languages.Add(new LanguageItem("images.jpg", "content3"));
     }
     private LanguageItem selectedLangComboItem;
     public LanguageItem SelectedLangComboItem
     {
       get { return selectedLangComboItem; }
       set
       {
         selectedLangComboItem=value;
         OnPropertyChanged("SelectedLangComboItem");
       }
     }
     private void OnPropertyChanged([CallerMemberName] string name = null)
     {
       PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));
     }
     public event PropertyChangedEventHandler PropertyChanged;
   }
   public class LanguageItem
   {
     public string Image { get; set; }
     public string Label { get; set; }
    
     public LanguageItem(string image, string label)
     {
       Image = image;
       Label = label;
     }
   }
 }

The result:

---

If the response is helpful, please click "Accept Answer" and upvote it.
 Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.