HProgressBar and VProgressBar controls
A progress bar has a range and a current position. The SetStep property allows you to set the size of the increments by which the current position advances as progress is shown. The default value is 10.
Use the spin control or enter an integer in the SetStep text box on the General page of the control’s Properties view.
SetStep takes an integer value. In the following example, the range of the progress bar is set to 0 to 500, and the step value is set to 50:
hpb_1.setrange(0,500)
hpb_1.setstep = 50
To set the increment size: