After re-implementing Korduene designer, these controls were considered and made sure that they were saved and loaded properly. However due to some issues like these controls have their own designer menus that so far I haven't been able to or had time to work around them. And now with the new Content window features we can work around that. So including these controls is long overdue.
Here are the controls:
ContextMenuStrip, MenuStrip, ToolStrip and StatusStrip
ErrorProvider is not included in the Toolbox, because it is used in a different way, so access is provided through the Graph.
The current issue with the first four mentioned controls is the designer menu, you will see that it's not the same as the other controls and can't create references and events directly from controls designer menu.
The current solution for the issue is going to the content window and and right click on the control to create a reference or get events.
* Please note that currently you need to save your form first to be able to see all the controls to show in the Content window.