- In xaml
<DataTemplate x:Key="OuterListItemTemplate">
<ListBox Name="InnerList"/>
</DataTemplate>
- In xaml.cs
for (int index = 0; index < OuterList.Items.Count; index++)
{ListBoxItem item = OuterList.ItemContainerGenerator.ContainerFromIndex(index) as ListBoxItem;
if (item != null)
{
ListBox innerList = FindChild<ListBox>(item, "InnerList");
if (innerList != null)
{
innerList .ItemsSource = data used for binding;
}
}
}
public static T FindChild<T>(DependencyObject parent, string childName)
where T : DependencyObject
{
// Confirm parent and childName are valid.
if (parent == null) return null;
T foundChild = null;
int childrenCount = VisualTreeHelper.GetChildrenCount(parent);
for (int i = 0; i < childrenCount; i++)
{
var child = VisualTreeHelper.GetChild(parent, i);
// If the child is not of the request child type child
T childType = child as T;
if (childType == null)
{
// recursively drill down the tree
foundChild = FindChild<T>(child, childName);
// If the child is found, break so we do not overwrite the found child.
if (foundChild != null) break;
}
else if (!string.IsNullOrEmpty(childName))
{
var frameworkElement = child as FrameworkElement;
// If the child's name is set for search
if (frameworkElement != null && frameworkElement.Name == childName)
{
// if the child's name is of the request name
foundChild = (T)child;
break;
}
}
else
{
// child element found.
foundChild = (T)child;
break;
}
}
return foundChild;
}
