Visual Tree

public static T GetVisualParent<T>(DependencyObject obj) where T : DependencyObject
{
DependencyObject parent = obj;
while (true)
{
if (parent == null) return null;
T t = parent as T;
if (t != null) return t;
parent = VisualTreeHelper.GetParent(parent);
}
}

public static ReadOnlyCollection<T> GetVisualChildren<T>(DependencyObject obj) where T : DependencyObject
{
List<T> list = new List<T>();
int count = VisualTreeHelper.GetChildrenCount(obj);
for (int i = 0; i < count; i++)
{
DependencyObject child = VisualTreeHelper.GetChild(obj, i);
if (child is T) list.Add((T)child);
list.AddRange(GetVisualChildren<T>(child));
}
return new ReadOnlyCollection<T>(list);
}

ListViewItem item = Utilities.GetVisualParent<ListViewItem>(btn);
if (item == null) return;
ReadOnlyCollection<ComboBoxEdit> cbxCollection= Haitai.Common.Utilities.GetVisualChildren<ComboBoxEdit>(item);