Show Toolbar in version 3.x polyscope

[jbm]

Check out this notice:

NOTICE: Supported and non-supported GUI elements in URCaps

The URCaps SDK (1.0, 1.1 and 1.2) supports implementation of two PolyScope GUI contributions; an installation node, and a program node. Both contributions are graphically designed in a subset of HTML. Some URCaps are today relying on other GUI components, not covered by the HTML subset. E.g. based on a Swing implementation, to create custom images, graphics, and even other components, such as full screen overlays, toolbars and popups. To ensure platform flexibility and provide a homogeneous …