The following Brushs are used by default and must be present in
Plotter3D:images/ otherwise a normal Textbutton with '??' as Label is shown.
You can define own brushs in menu Settings/Imagebuttons....

Description of files in Plotter3D:images/

 Name				Used for
------------------------------------------------------------------------------
 ComplexPreview.brush		- Open Complexpreview-Window
 LineMesh.brush			- set PreviewStyle to Linemesh
 LineXMesh.brush		- set PreviewStyle to X-Lines
 LineYMesh.brush		- set PreviewStyle to Y-Lines
 Move.brush			- set Mousehandle to Movement
 NoPreview.brush		- switch Preview off
 PointMesh.brush		- set PreviewStyle to Pointmesh
 Rotation.brush			- set Mousehandle to Rotation
 SimplePreview.brush		- set PreviewStyle to Simplepreview
 Transformation.brush		- Open Transformation-Window
 Render.brush			- Open Render window
 RealTime.brush			- Open Realtime window
 Information.brush		- Open Information window
 Select.brush			- switches to Select-mode

The File 'Buttons.ilbm' contains all buttons within one picture.

Of course you can not only use brushs. Also (small) IFF-pictures can be used
as imagebuttons.