fixed #752

src/Shared/HandyControl_Shared/Controls/Input/CheckComboBox/CheckComboBox.cs

@@ -239,7 +239,6 @@ namespace HandyControl.Controls
             }
 
             _panel.Children.Clear();
-            var dataContext = DataContext;
 
             foreach (var item in SelectedItems)
             {
@@ -251,7 +250,7 @@ namespace HandyControl.Controls
                         Tag = checkComboBoxItem
                     };
 
-                    if (dataContext != null)
+                    if (ItemsSource != null)
                     {
                         tag.SetBinding(ContentControl.ContentProperty, new Binding(DisplayMemberPath) { Source = item });
                     }