The database field by which to filter a ChooseFromList attached to the edit box.
When the user enters a value in the text box and then presses the tab key, the ChooseFromList dialog is displayed with only those rows where the value of the field specified in this property starts with the entered text.
For example, if the ChooseFromList displays business partners and this property is set to CardCode, when the user enters A in the edit box and presses the tab key, the ChooseFromList is displayed with only rows where the code starts with an A. If this property is set to CardName, then the same action displays only rows where the name starts with an A.
In either case, after the user selects a value, the key of the selected row is entered into the text box.