Ignoring Empty Values in Editors
The TextEdit.MaskIgnoreBlank property is in effect for the Simple, Regular and RegEx mask types. If this property is set to true, an empty editor can lose focus. If the editor's value is partially completed, focus cannot be moved from the editor until an end-user enters the entire value, or removes the value by clearing the edit box.
If the TextEdit.MaskIgnoreBlank property is set to false, focus cannot be moved from the editor until the value is totally complete.