By default, the AllowSubTotal property is "<fgcolor=808080><b>SubTotal</b></fgcolor>", which indicates that the SubTotal keyword specifies the sub-total of previously lines in the control. If the AllowSubTotal property is "", the control supports no SubTotal aggregate function. The FormatSubTotalResult / FormatLocal property defines the format to display the result of a Total line. The BackColorSubTotalLine property specifies the background color to show the SubTotal line. The AllowVariables property specifies the expression ( no HTML ) that defines the equal operator, so you can define variables.

By default, the control supports the following aggregate functions:

• AllowTotal property defines the Total keyword. The Total keyword, specifies the sum of all lines that are not empty, valid and defines no variables.
• AllowSubTotal property defines the SubTotal keyword. The SubTotal keyword, specifies the sum of all previously lines that are not empty, valid, defines no variables until another SubTotal keyword is found.
• AllowCount property defines the Count keyword. The Count keyword, counts all lines that are not empty, valid and defines no variables.
• AllowSubCount property defines the SubCount keyword. The SubCount keyword, counts all previously lines that are not empty, valid, defines no variables until another SubCount keyword is found.

The following screen show shows a control that displays SubTotal lines: