Purpose: The DisplayWithin key filter forces textboxes and table cells to accept only digits defining an integer in a range specified by the format property.
Usage: The value range is entered into the format property as two integers, the minimum and maximum allowable values, separated by a tab character. The two characters “\t” can be used to represent the tab character.
Examples:
100\t1000
0\t32767
Notes:
1. If the format property contains an invalid range, the valid property will return false always.
2. If the format property is empty, the valid property will return true always.