You can draw a new brush shape or update the current
            brush shape in the editing panel. The new shape is drawn using the brush
            that you selected to open the Custom Brush menu.
         
         NoteYou cannot use the Undo command when drawing
               or updating a custom brush.
            
         To
            draw a brush shape:
         
         
            - To
               create a new shape, erase the existing brush shape by painting over
               the editing panel.
            
- Draw
               the new shape.
            
- To
               invert the brush shape, click Invert.
            
- To
               blur the brush shape, click Blur. Each time you click Blur, a 3 x
               3 filter is applied to the brush image.