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.
3. An empty textbox is invalid.