tearing down event handlers on page disappears

src/App/Controls/ExtendedToolbarItem.cs

@@ -0,0 +1,30 @@
+using System;
+using Xamarin.Forms;
+
+namespace Bit.App.Controls
+{
+    public class ExtendedToolbarItem : ToolbarItem, IDisposable
+    {
+        public ExtendedToolbarItem(Action clickAction = null)
+        {
+            ClickAction = clickAction;
+        }
+
+        public Action ClickAction { get; set; }
+
+        protected virtual void ClickedItem(object sender, EventArgs e)
+        {
+            ClickAction?.Invoke();
+        }
+
+        public void InitEvents()
+        {
+            Clicked += ClickedItem;
+        }
+
+        public void Dispose()
+        {
+            Clicked -= ClickedItem;
+        }
+    }
+}