diff --git a/Elwig/Controls/CheckComboBox.cs b/Elwig/Controls/CheckComboBox.cs
index e108505..0d4c2d6 100644
--- a/Elwig/Controls/CheckComboBox.cs
+++ b/Elwig/Controls/CheckComboBox.cs
@@ -124,19 +124,24 @@ namespace Elwig.Controls {
             SelectItemsReverse();
             var dmp = !string.IsNullOrEmpty(ListDisplayMemberPath) ? ListDisplayMemberPath : !string.IsNullOrEmpty(DisplayMemberPath) ? DisplayMemberPath : null;
             if (SelectedItems.Count == ItemsSource.Cast<object>().Count() && AllItemsSelectedContent != null) {
-                _textBox.Text = AllItemsSelectedContent;
                 AllItemsSelected = true;
             } else if (SelectedItems.Count == 0) {
-                _textBox.Text = "";
                 AllItemsSelected = false;
+            } else {
+                AllItemsSelected = null;
+            }
+            if (SelectedItems.Count > 1 && SelectedItems.Count == ItemsSource.Cast<object>().Count() && AllItemsSelectedContent != null) {
+                _textBox.Text = AllItemsSelectedContent;
+            } else if (SelectedItems.Count == 0) {
+                _textBox.Text = "";
             } else {
                 _textBox.Text = string.Join(Delimiter,
                     dmp == null ? SelectedItems.Cast<object>() :
                     SelectedItems.Cast<object>()
                         .Select(i => i.GetType().GetProperty(dmp)?.GetValue(i))
                 );
-                AllItemsSelected = null;
             }
+
             RaiseEvent(new SelectionChangedEventArgs(SelectionChangedEvent, evt.RemovedItems, evt.AddedItems));
         }