SIZE {IS} length [CELL ] {= } [CELLS ] [PIXEL ] [PIXELS]
Typically, the length field represents the logical width of the control. Frequently, this is based on the size of the control's title or value. For example, an ENTRY-FIELD's width of 8 would specify a field large enough to enter eight (average size) characters. If this phrase is omitted, the control type employs its own method of determining a default size.
SIZE = 15 CELLS
causes the control to have a width of 15 cells, where the exact width of a cell is inherited from the parent window.
SIZE = 150 PIXELS
causes the control to have a width of 150 pixels, where the exact width of a pixel is inherited from the parent window. Non-integer values are not allowed with pixels.