>>>Hello,
>>>
>>>What is the use of Object.Tag?
>>
>>You can keep any data there (that data must be Char) From Help for TAG property:
>>Stores any extra data needed for your program. Available at design time and run time.
>
>Yes, I understand that...
>
>But, I just found out that mostly every object has such property, but I would like to ask UT users where they used this property. Is it usefull? Maybe there is some function getObjectByTag?

No there is not a such object. Tag is simply a property that you might use to store char data. Some uses. ie:

*Form activate - I want this to run once after init
if empty(this.Tag)
  this.Tag = 'done'
  *...
endif

* A textbox keeping pre-edit values - usefull for say summing grid column
*Gotfocus
this.Tag = transform(this.Value) 

Cetin