Add this.panel into expression function context in panel dynamic ques…

src/question_matrixdropdownbase.ts

@@ -358,14 +358,14 @@ implements ISurveyData, ISurveyImpl, ILocalizableOwner {
     }
     values[MatrixDropdownRowModelBase.IndexVariableName] = this.rowIndex;
     values[MatrixDropdownRowModelBase.RowValueVariableName] = this.rowName;
-    if (!properties) properties = {};
-    properties[MatrixDropdownRowModelBase.RowVariableName] = this;
+    const newProps = Helpers.createCopy(properties);
+    newProps[MatrixDropdownRowModelBase.RowVariableName] = this;
     for (var i = 0; i < this.cells.length; i++) {
       values[MatrixDropdownRowModelBase.RowVariableName] = this.value;
-      this.cells[i].runCondition(values, properties);
+      this.cells[i].runCondition(values, newProps);
     }
     if (!!this.detailPanel) {
-      this.detailPanel.runCondition(values, properties);
+      this.detailPanel.runCondition(values, newProps);
     }
   }
   public clearValue() {

src/question_paneldynamic.ts

@@ -1518,14 +1518,16 @@ export class QuestionPanelDynamicModel extends Question
       cachedValues[QuestionPanelDynamicItem.ParentItemVariableName] = (<any>this.parent).getValue();
     }
     for (var i = 0; i < this.panels.length; i++) {
-      var panelValues = this.getPanelItemData(this.panels[i].data);
+      const panel = this.panels[i];
+      var panelValues = this.getPanelItemData(panel.data);
       //Should be unique for every panel due async expression support
-      var newValues = Helpers.createCopy(cachedValues);
-      newValues[
-        QuestionPanelDynamicItem.ItemVariableName.toLowerCase()
-      ] = panelValues;
+      const newValues = Helpers.createCopy(cachedValues);
+      const panelName = QuestionPanelDynamicItem.ItemVariableName;
+      newValues[panelName] = panelValues;
       newValues[QuestionPanelDynamicItem.IndexVariableName.toLowerCase()] = i;
-      this.panels[i].runCondition(newValues, properties);
+      const newProps = Helpers.createCopy(properties);
+      newProps[panelName] = panel;
+      panel.runCondition(newValues, newProps);
     }
   }
   onAnyValueChanged(name: string) {

tests/entries/test.ts

@@ -14,7 +14,7 @@ export * from "../surveyLocalizationTests"; //
 export * from "../surveyquestiontests"; //
 export * from "../question_matrixdynamictests";
 export * from "../question_matrixdropdownbasetests";
-export * from "../surveypaneldynamictests";
+export * from "../question_paneldynamic_tests";
 export * from "../surveyserializationtests"; //
 export * from "../surveytests"; //
 export * from "../surveyWindowTests"; //

tests/surveypaneldynamictests.ts → tests/question_paneldynamic_tests.ts

@@ -6037,4 +6037,35 @@ QUnit.test("paneldynamic.removePanelUI & confirmActionAsync, #6736", function(as
   assert.deepEqual(panel.value, [{ q1: 1 }, { q1: 3 }], "Row is deleted correctly");
 
   settings.confirmActionAsync = prevAsync;
-});
+});
+QUnit.test("panel property in custom function", function (assert) {
+  const panelCustomFunc = function (params: any) {
+    if(!this.panel) return "";
+    const q = this.panel.getQuestionByName(params[0]);
+    if(q && !q.isEmpty()) return q.value + q.value;
+    return "";
+  };
+  FunctionFactory.Instance.register("panelCustomFunc", panelCustomFunc);
+  const survey = new SurveyModel({
+    elements: [
+      {
+        type: "paneldynamic",
+        name: "panel1",
+        templateElements: [
+          { name: "q1", type: "text" },
+          {
+            name: "q2",
+            type: "expression",
+            expression: "panelCustomFunc('q1')",
+          },
+        ],
+        panelCount: 2,
+      },
+    ],
+  });
+  const question = <QuestionPanelDynamicModel>survey.getQuestionByName("panel1");
+  const panel = question.panels[0];
+  panel.getQuestionByName("q1").value = "abc";
+  assert.equal(panel.getQuestionByName("q2").value, "abcabc", "Custom function with row property works correctly");
+  FunctionFactory.Instance.unregister("panelCustomFunc");
+});