## DY

Size of the vertical scrollbar's thumbnail in any unit.

### Value

Any floating-point value greater than zero and smaller than the difference between YMAX and YMIN.

Default:: "0.1".

### Notes

LINEY, YMAX and YMIN are only updated in the scrollbar when DY is updated.

When the canvas is visible, a change in DY can generate a redraw in the horizontal scrollbar on the screen. But it may generate a RESIZE_CB callback event if YAUTOHIDE=Yes.

A change in these values can affect the attribute POSY.

### Affects

IupCanvas

### See Also

SCROLLBAR