fix(demo): use reflection for RadioButtonGroup.setItems compatibility

Reflection keeps the demo compatible with Vaadin 14 and 24+.

Author: paodb

src/test/java/com/flowingcode/vaadin/addons/orgchart/EditChartDemo.java

@@ -177,7 +177,7 @@ private VerticalLayout getEditionLayout() {
     // Action Selector
     actionSelector = new RadioButtonGroup<>();
     actionSelector.setLabel("Select Action");
-    actionSelector.setItems("Add", "Edit", "Delete");
+    ReflectionUtil.setItems(actionSelector,"Add", "Edit", "Delete");
     actionSelector.addValueChangeListener(event -> updateComponentStates());
 
     Div separator = new Div();
@@ -204,7 +204,7 @@ private VerticalLayout getEditionLayout() {
     // Relation type selector
     typeSelector = new RadioButtonGroup<String>();
     typeSelector.setLabel("Select Relation Type:");
-    typeSelector.setItems("Parent(root)", "Child", "Sibling");
+    ReflectionUtil.setItems(typeSelector, "Parent(root)", "Child", "Sibling");
     typeSelector.setValue("Child");
     typeSelector.addThemeVariants(RadioGroupVariant.LUMO_VERTICAL);
 

src/test/java/com/flowingcode/vaadin/addons/orgchart/ReflectionUtil.java

@@ -0,0 +1,41 @@
+/*-
+ * #%L
+ * OrgChart Add-on
+ * %%
+ * Copyright (C) 2017 - 2026 Flowing Code
+ * %%
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * #L%
+ */
+package com.flowingcode.vaadin.addons.orgchart;
+
+import java.util.Arrays;
+import java.util.Collection;
+
+import com.vaadin.flow.component.radiobutton.RadioButtonGroup;
+
+public class ReflectionUtil {
+
+  /** Reflective call in order to mantain binary compatibility with Vaadin 14 - 24+ */
+  static void setItems(RadioButtonGroup<String> radioButtonGroup,
+      String... items) {
+    try {
+      RadioButtonGroup.class
+          .getMethod("setItems", Collection.class)
+          .invoke(radioButtonGroup, Arrays.asList(items));
+    } catch (Exception e) {
+      throw new RuntimeException(e);
+    }
+  }
+
+}