I’m using a standard SF Maintenance Form. How do you set up the form to allow the user to Tab to the toolstrip buttons? I’ve tried setting the TabStop property of the MaintenanceToolStrip to True but that doesn’t seem to do anything

There's a TabStop property on the MaintenanceFormToolstrip in addition to the TabIndex property. The TabStop property defaults to False on a toolstrip. I believe if you set it to True, you should be able to tab to the toolstrip.