Fixed a bug with persistent panel "leaking" items UI and fixed the persistent not showing up in some cases.

Assets/ScriptableRenderPipeline/Core/Debugging/DebugMenuUI.cs

             m_DebugMenuManager = manager;
         }
 
+        // HACK: for some reason, the layout of the selected menu may fail if the previous menu in the list is disabled
+        // Disabling and re-enabling everything seems to fix the issue...
+        private void HackSelectPanel()
+        {
+            m_MainMenuRoot.SetActive(false);
+            m_MainMenuRoot.SetActive(true);
+        }
+
         public void EnablePersistentView(bool value)
         {
             m_PersistentPanelRoot.SetActive(value);
 
             m_DebugPanelUIs[m_ActivePanelIndex].SetSelected(true);
 
-            // HACK: for some reason, the layout of the selected menu may fail if the previous menu in the list is disabled
-            // Disabling and re-enabling everything seems to fix the issue...
-            m_MainMenuRoot.SetActive(false);
-            m_MainMenuRoot.SetActive(true);
+            HackSelectPanel();
         }
 
         public void NextDebugPanel()
             m_DebugPanelUIs[m_ActivePanelIndex].SetSelected(true);
 
-            // HACK: for some reason, the layout of the selected menu may fail if the previous menu in the list is disabled
-            // Disabling and re-enabling everything seems to fix the issue...
-            m_MainMenuRoot.SetActive(false);
-            m_MainMenuRoot.SetActive(true);
+            HackSelectPanel();
         }
 
         public void ToggleMenu()
             else
             {
                 m_PersistentDebugPanelUI.SetSelected(true);
+                m_PersistentDebugPanelUI.ResetSelectedItem();
+                HackSelectPanel();
             }
         }
 

Assets/ScriptableRenderPipeline/Core/Debugging/DebugPanelUI.cs

             if (m_Root == null)
                 return;
 
-            for (int i = 0; i < m_Root.transform.childCount; ++i)
+            foreach (Transform child in m_Root.transform)
-                Object.DestroyImmediate(m_Root.transform.GetChild(i).gameObject);
+                GameObject.Destroy(child.gameObject);
+
             BuildGUIImpl(m_Root);
         }
 
-            DebugMenuUI.CreateTextElement(string.Format("{0} Title", m_DebugPanel.name), m_DebugPanel.name, 14, TextAnchor.MiddleLeft, m_Root);
+            DebugMenuUI.CreateTextElement(string.Format("{0} Title", m_DebugPanel.name), m_DebugPanel.name, 14, TextAnchor.MiddleLeft, parent);
 
             m_ItemsUI.Clear();
             for (int i = 0; i < m_DebugPanel.itemCount; i++)
             return null;
         }
 
+        public void ResetSelectedItem()
+        {
+            SetSelectedItem(-1);
+        }
+
         void SetSelectedItem(int index)
         {
             if (m_SelectedItem != -1)
 
             m_SelectedItem = index;
-            m_ItemsUI[m_SelectedItem].SetSelected(true);
+            if(m_SelectedItem != -1)
+                m_ItemsUI[m_SelectedItem].SetSelected(true);
         }
 
         public void SetSelected(bool value)