From b3963e81730197db27d02e03a7bd1baf612cc9bd Mon Sep 17 00:00:00 2001
From: zepumph <michael.kauzmann@colorado.edu>
Date: Mon, 16 Aug 2021 13:59:19 -0600
Subject: [PATCH] create Properties to control displayOnly of every diameter
 control and every mass too,
 https://github.com/phetsims/projectile-motion/issues/270

---
 js/NumberControl.js | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/js/NumberControl.js b/js/NumberControl.js
index 6d6249855..cb97c7f33 100644
--- a/js/NumberControl.js
+++ b/js/NumberControl.js
@@ -355,15 +355,15 @@ class NumberControl extends Node {
     // @private
     this.numberDisplay = numberDisplay;
 
-    // @private for use via PhET-iO, see https://github.com/phetsims/sun/issues/451
+    // @public, for use via PhET-iO, see https://github.com/phetsims/sun/issues/686
     // This is not generally controlled by the user, so it is not reset when the Reset All button is pressed.
-    const displayOnlyProperty = new BooleanProperty( false, {
+    this.displayOnlyProperty = new BooleanProperty( false, {
       tandem: options.tandem.createTandem( 'displayOnlyProperty' ),
       phetioFeatured: true,
       phetioDocumentation: 'disables interaction with the NumberControl and ' +
                            'makes it appear like a display that shows the current numeric value'
     } );
-    displayOnlyProperty.link( displayOnly => {
+    this.displayOnlyProperty.link( displayOnly => {
       this.slider.visible = !displayOnly;
       if ( decrementButton ) {
         decrementButton.visible = !displayOnly;
@@ -373,7 +373,6 @@ class NumberControl extends Node {
       }
     } );
 
-
     // @private
     this.disposeNumberControl = () => {
       numberDisplay.dispose();