Thank you to all of you guys for your help. Unfortunately none of your advises works.
* RELEASE WINDOW doesn't close this window either
* TYPE("name") shows U
* DISPLAY OBJECTS shows nothing and my window is still on the screen and even reacts on events.
* CLEAR ALL eventually helps and closes the form but this is not what I want.

Detailed description of the problem:
- I contracted my browser class which I use to let the user to browse tables, select items form them, delete them or get relevant information
- Grid controll is the main part of the class
- Grid columns contain my own class text-boxes with DragMode = 0 and this.Drag in DblClick event
- When I start dragging and put the control anywhere, even on the same place, the problem appeares
- The form is than impossible to be released
- The form is lunch with DO FORM name LINKED v_name
- Form's Destroy event contains RELEASE v_name
- Everything worked well in VFP3.0b!!!

Thank you for futher help!!!
Marcin Konopka
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>I presume that Marcin is who started this, so this response is actually directed to Marcin. . .
>
>It seems that if ANY reference anywhere at all might exist to any object, then that object will NOT be released from memory.
>I base this SOLELY on the statement at top of page 72 of the VFP 5.0 Developer's Guide which states:
>" However, because a reference to an object belonging to frmInvoice still exists, the object is NOT RELEASED FROM MEMORY UNTIL txtCustName is released with the following command:
> RELEASE txtCustName "
>Note that on the prior page txtCustName was setup as a reference to the object frmInvoice [ who would have guessed that these lines had anything to do with the next page, but that's the way MS has chosen to 'document' FoxPro, so that's what we get].
>
>In the absence of any other relevant information, this is the best I can offer.
>
>Good luck
>
>>>I've just installed 5.0 and unfortunately faced a problem I can't cope with. Some forms are not possible to be released after any control was dragged form them. It doesn't happen always, but in 90% cases. All the forms are linked with a variable and all the controls being dragged are text boxes in a grid (manual dragging started with double-click). The variable (object) is destroyed but the form still exist and the only way to close it is to quit FoxPro.
>>>
>>>Can anybody help??
>>Usually this is because a variable holds a reference to an object.
>>
>>Foxpro is supposed to release objects when the reference count is zero. But it doesn't seem to do it right every time.
>>
>>It is a very good idea for you to set all object pointers you create to .NULL. when you exit from a form because of that problem.
>>
>>
>>When you say "the variable is destroyed" can you show me the code?
>>How do you know the object is destroyed?
>>
>>Can you describe what your program is meant to do?
>>And how the Drag and Drop achieves this?