The Scissors
The Scissors are selected from the Image Toolbox. They’re used to grab Custom Brushes.
To use the Scissors, move the mouse to the point at which you would like one corner of the brush to lie, hold the mouse button and drag the mouse to the opposite corner.
The brush will be grabbed, inclusive of the scissors guide, and added to the brush list. The Brush view box will be updated.
Grabbing a brush with the right mouse button will replace its area on the canvas with a rectangle of the current paper colour.