# System.ComponentModel.Design

``` diff
 namespace System.ComponentModel.Design {
     public sealed class DesignerActionPropertyItem : DesignerActionItem {
-        public DesignerActionPropertyItem(string memberName, string displayName);
+        public DesignerActionPropertyItem(string memberName, string? displayName);
     }
     public class DesignerActionTextItem : DesignerActionItem {
-        public DesignerActionTextItem(string displayName, string category);
+        public DesignerActionTextItem(string? displayName, string? category);
     }
     public class DesignerCommandSet {
-        public virtual ICollection GetCommands(string name);
+        public virtual ICollection? GetCommands(string name);
     }
     public abstract class ObjectSelectorEditor : UITypeEditor {
         public class SelectorNode : TreeNode {
-            public object value;
+            public object? value;
-            public SelectorNode(string label, object value);
+            public SelectorNode(string label, object? value);
         }
     }
 }
```

