Estimado Carito,
En vez de usar una cadena para el tooltip usa un array con este formato:
Tooltips support an array with up to 8 elements: window.prg:3539-3571
The array structure is:
cText - Tooltip text
cTitle - Tooltip title
cIcon - Icon handle or name
nClrFore - Text color (foreground)
nClrBack - Background color
nWidth - Maximum width
nDelayTime - Duration in milliseconds
nDelayType - Type of delay (TTDT_AUTOPOP, TTDT_INITIAL, or TTDT_RESHOW)
Delay Type Constants winapi.ch:276-279
TTDT_AUTOMATIC (0) - Automatic timing
TTDT_RESHOW (1) - Delay before showing tooltip again
TTDT_AUTOPOP (2) - How long tooltip remains visible
TTDT_INITIAL (3) - Delay before tooltip first appears