fix

.gitignore

 # Builds
 *.apk
 *.unitypackage
+
+# node.js
+#
+node_modules/
+npm-debug.log
+yarn-error.log

Assets/UIWidgets/rendering/object.mixin.gen.cs

             }
         }
 
-        public void insert(ChildType child, ChildType after = null) {
+        public virtual void insert(ChildType child, ChildType after = null) {
-        public void add(ChildType child) {
+        public virtual void add(ChildType child) {
-        public void addAll(List<ChildType> children) {
+        public virtual void addAll(List<ChildType> children) {
             if (children != null) {
                 children.ForEach(this.add);
             }
             this._childCount--;
         }
 
-        public void remove(ChildType child) {
+        public virtual void remove(ChildType child) {
-        public void removeAll() {
+        public virtual void removeAll() {
             ChildType child = this._firstChild;
             while (child != null) {
                 var childParentData = (ParentDataType) child.parentData;
             }
         }
 
-        public void insert(ChildType child, ChildType after = null) {
+        public virtual void insert(ChildType child, ChildType after = null) {
-        public void add(ChildType child) {
+        public virtual void add(ChildType child) {
-        public void addAll(List<ChildType> children) {
+        public virtual void addAll(List<ChildType> children) {
             if (children != null) {
                 children.ForEach(this.add);
             }
             this._childCount--;
         }
 
-        public void remove(ChildType child) {
+        public virtual void remove(ChildType child) {
-        public void removeAll() {
+        public virtual void removeAll() {
             ChildType child = this._firstChild;
             while (child != null) {
                 var childParentData = (ParentDataType) child.parentData;

Assets/UIWidgets/rendering/object.mixin.njk

             }
         }
 
-        public void insert(ChildType child, ChildType after = null) {
+        public virtual void insert(ChildType child, ChildType after = null) {
-        public void add(ChildType child) {
+        public virtual void add(ChildType child) {
-        public void addAll(List<ChildType> children) {
+        public virtual void addAll(List<ChildType> children) {
             if (children != null) {
                 children.ForEach(this.add);
             }
             this._childCount--;
         }
 
-        public void remove(ChildType child) {
+        public virtual void remove(ChildType child) {
-        public void removeAll() {
+        public virtual void removeAll() {
             ChildType child = this._firstChild;
             while (child != null) {
                 var childParentData = (ParentDataType) child.parentData;