A condition statement applied to all items in the tree, hiding those that don't meet the condition.
Any valid condition statement.
The Filter property is a way to hide items that don't meet a certain condition. Conditions are supported in several Tree control properties, and this one uses the same syntax as the others. In this case, the condition is used to determine if an item is visible or not. Think of it this way: if the condition evaluates to 1 for an item, then its ItemVisible property is set to 1. The items are never removed, only hidden. Setting this property to "" removes the filter entirely.