PowerBuilder Classic 12.1 has a new height expression function for the DataWindow object. This function is only supported in PowerBuilder Native. It is not supported in Windows Forms, Web Forms, or PowerBuilder .NET. The new DataWindow expression function FontHeight allows you to find the height of the font for a column or computed field. This function takes the column name as an argument. Use this function to set the minimum height to the size of the font.
For example:
dw_1.object.fname.Height = "0~tFontHeight(fname)"