Tool Bar Style can be Advanced or Simple.
Advanced toolbar generally look like this example, using the command bitmaps and a small size.
Use the advanced style when a large number of tool bar options are required and they need to wrap onto secondary lines:
Simple toolbars present a simple and easier interface for new users. They are built from the command icons and generally are much larger, like this example.
They do not wrap on secondary lines so the number you can display is limited by the width of the device.
This property is in the Framework Details tab.