diff --git a/front_end/model_concepts.js b/front_end/model_concepts.js
index 136f487..884ffc4 100644
--- a/front_end/model_concepts.js
+++ b/front_end/model_concepts.js
@@ -114,9 +114,14 @@ function initializeSamplerNode(node) {
     });
 
     saveBtn.serialize = false;
-    node.widgets.splice(node.widgets.indexOf(saveBtn), 1);
-    node.widgets.unshift(saveBtn);
+    saveBtn.options = saveBtn.options || {};
+    saveBtn.options.serialize = false;
+    //node.widgets.splice(node.widgets.indexOf(saveBtn), 1);
+    // Do NOT unshift here. Button stays at the end so configure() can assign
+    // widget values by position without the button consuming index [0].
+    // The unshift happens in onConfigure, after configure() has already run.
     applyPrimereButtonStyle(saveBtn);
+    node.__primereSaveBtn = saveBtn;
 
     const originalOnWidgetChanged = node.onWidgetChanged;
     node.onWidgetChanged = function (name, value, oldValue, widget) {
@@ -132,6 +137,8 @@ function initializeSamplerNode(node) {
     node.conceptDisplayWidget.inputEl.readOnly = true;
     node.conceptDisplayWidget.inputEl.placeholder = "Runtime model type will appear here";
     node.conceptDisplayWidget.serialize = false;
+    node.conceptDisplayWidget.options = node.conceptDisplayWidget.options || {};
+    node.conceptDisplayWidget.options.serialize = false;
 
     const originalOnExecuted = node.onExecuted;
     node.onExecuted = function (message) {