diff --git a/src/VirtualPage.php b/src/VirtualPage.php
index bfb79179f1..d3f08a6b42 100644
--- a/src/VirtualPage.php
+++ b/src/VirtualPage.php
@@ -32,7 +32,7 @@ protected function init(): void
         parent::init();
 
         $this->cb = $this->add([Callback::class, 'urlTrigger' => $this->urlTrigger ?: $this->name]);
-        unset($this->urlTrigger);
+        unset($this->{'urlTrigger'});
     }
 
     public function getUrlTrigger(): string
diff --git a/tests/CallbackTest.php b/tests/CallbackTest.php
index 5595473c92..d8e43b9039 100644
--- a/tests/CallbackTest.php
+++ b/tests/CallbackTest.php
@@ -5,7 +5,9 @@
 namespace Atk4\Ui\Tests;
 
 use Atk4\Core\Phpunit\TestCase;
+use Atk4\Ui\AbstractView;
 use Atk4\Ui\Callback;
+use Atk4\Ui\VirtualPage;
 
 class AppMock extends \Atk4\Ui\App
 {
@@ -45,12 +47,19 @@ protected function tearDown(): void
         $_POST = [];
     }
 
+    /**
+     * @param Callback|VirtualPage $cb
+     */
+    protected function simulateCallbackTriggering(AbstractView $cb): void
+    {
+        $_GET[Callback::URL_QUERY_TRIGGER_PREFIX . $cb->getUrlTrigger()] = '1';
+    }
+
     public function testCallback(): void
     {
         $cb = \Atk4\Ui\Callback::addTo($this->app);
 
-        // simulate triggering
-        $_GET[Callback::URL_QUERY_TRIGGER_PREFIX . $cb->name] = '1';
+        $this->simulateCallbackTriggering($cb);
 
         $var = null;
         $cb->set(function ($x) use (&$var) {
@@ -77,14 +86,10 @@ public function testViewUrlCallback(): void
         $cb = \Atk4\Ui\Callback::addTo($v1, ['urlTrigger' => 'bb']);
         $cb->name = 'bbx';
 
-        // simulate triggering
-        $_GET[Callback::URL_QUERY_TRIGGER_PREFIX . $cb->name] = '1';
-
-        // test for non sticky
-        $cb->setUrlTrigger($cb->name);
+        $this->simulateCallbackTriggering($cb);
 
         $this->assertSame('?__atk_cb_aa=callback&__atk_cbtarget=aa', $cbApp->getUrl());
-        $this->assertSame('?__atk_cb_bbx=callback&__atk_cbtarget=bbx', $cb->getUrl());
+        $this->assertSame('?__atk_cb_bb=callback&__atk_cbtarget=bb', $cb->getUrl());
 
         $var = null;
         $cb->set(function ($x) use (&$var, $v1) {
@@ -104,7 +109,8 @@ public function testCallbackNotFiring(): void
     {
         $cb = \Atk4\Ui\Callback::addTo($this->app);
 
-        // don't simulate triggering
+        // do NOT simulate triggering
+
         $var = null;
         $cb->set(function ($x) use (&$var) {
             $var = $x;
@@ -117,8 +123,7 @@ public function testCallbackLater(): void
     {
         $cb = \Atk4\Ui\CallbackLater::addTo($this->app);
 
-        // simulate triggering
-        $_GET[Callback::URL_QUERY_TRIGGER_PREFIX . $cb->name] = '1';
+        $this->simulateCallbackTriggering($cb);
 
         $var = null;
         $cb->set(function ($x) use (&$var) {
@@ -137,15 +142,14 @@ public function testCallbackLaterNested(): void
     {
         $cb = \Atk4\Ui\CallbackLater::addTo($this->app);
 
-        // simulate triggering
-        $_GET[Callback::URL_QUERY_TRIGGER_PREFIX . $cb->name] = '1';
-        $_GET[Callback::URL_QUERY_TRIGGER_PREFIX . $cb->name . '_2'] = '1';
+        $this->simulateCallbackTriggering($cb);
 
-        $app = $this->app;
         $var = null;
-        $cb->set(function ($x) use (&$var, $app, &$cbname) {
-            $cb2 = \Atk4\Ui\CallbackLater::addTo($app);
-            $cbname = $cb2->name;
+        $cb->set(function ($x) use (&$var) {
+            $cb2 = \Atk4\Ui\CallbackLater::addTo($this->app);
+
+            $this->simulateCallbackTriggering($cb2);
+
             $cb2->set(function ($y) use (&$var) {
                 $var = $y;
             }, [$x]);
@@ -179,10 +183,9 @@ public function testCallbackLaterNotFiring(): void
 
     public function testVirtualPage(): void
     {
-        $vp = \Atk4\Ui\VirtualPage::addTo($this->app);
+        $vp = VirtualPage::addTo($this->app);
 
-        // simulate triggering
-        $_GET[Callback::URL_QUERY_TRIGGER_PREFIX . $vp->name] = '1';
+        $this->simulateCallbackTriggering($vp);
 
         $var = null;
         $vp->set(function ($p) use (&$var) {
@@ -196,10 +199,9 @@ public function testVirtualPage(): void
 
     public function testVirtualPageCustomTrigger(): void
     {
-        $vp = \Atk4\Ui\VirtualPage::addTo($this->app, ['urlTrigger' => 'bah']);
+        $vp = VirtualPage::addTo($this->app, ['urlTrigger' => 'bah']);
 
-        // simulate triggering
-        $_GET[Callback::URL_QUERY_TRIGGER_PREFIX . 'bah'] = '1';
+        $this->simulateCallbackTriggering($vp);
 
         $var = null;
         $vp->set(function ($p) use (&$var) {
@@ -220,10 +222,9 @@ public function callPull230()
 
     public function testPull230(): void
     {
-        $vp = \Atk4\Ui\VirtualPage::addTo($this->app);
+        $vp = VirtualPage::addTo($this->app);
 
-        // simulate triggering
-        $_GET[Callback::URL_QUERY_TRIGGER_PREFIX . $vp->name] = '1';
+        $this->simulateCallbackTriggering($vp);
 
         $vp->set(\Closure::fromCallable([$this, 'callPull230']));