Can I use ‘Pattern Brush’, ‘Fill Pattern’ or ‘Gradation’ in the toolbox?

Yes, you can. Click on the edge at in the top area of the tool box. The tool box will become wider and all of the tools will be displayed. In the basic tool box mode, click on the Copy Tool to launch the window where you can select from Copy Tool and Pattern Brush Tool.

If you click in the Paint Bucket tool it will launch the window where you can select Paint Bucket Tool, Fill Pattern Tool or Gradation Tool.