fixed #379

src/Shared/HandyControl_Shared/Controls/SideMenu/SideMenu.cs

@@ -170,6 +170,16 @@ namespace HandyControl.Controls
                     }
                     else if (sideMenuItem.IsSelected)
                     {
+                        switch (sideMenuItem.Role)
+                        {
+                            case SideMenuItemRole.Header:
+                                _selectedHeader = sideMenuItem;
+                                break;
+                            case SideMenuItemRole.Item:
+                                _selectedItem = sideMenuItem;
+                                break;
+                        }
+
                         ShowSelectedOne(sideMenuItem);
                         sideMenuItemSelected = sideMenuItem;