>Wondering if anyone else has seen this. I'm working on my Drag and drop session for Southwest Fox and I just spent an hour or more down a rabbit hole.
>
>Just to demo how the various PEMs interact, I set up a checkbox as a drop target and added code so that if you dropped text on it, its caption would change. (Yeah, not all that relevant in real life, but a slick demo.) When I got it working, I found that the form would no longer close. Instead I got the error "File cannot be closed because outstanding references exist."
>
>I've tested using the form or a command button as the drop target and it works fine without the problem.
>
>Here's the set-up:
>
>1) Textbox has code in MouseDown that boils down to:
>
>

>This.OLEDrag(.T.)
>

>
>(That is, there's other code, but it's not relevant to this problem. I'm creating some generic classes to make it easier to create these demos.)
>
>2) Checkbox is set up as follows:
>
> Caption: Drop here
> OLEDropMode: 1-Enabled
>
> DragOver contains:
>
>

>IF oDataObject.GetFormat(1)
>	This.OLEDropHasData = 1
>	This.OLEDropEffects = 1
>ENDIF 
>

>
> DragDrop contains:
>
>

>IF This.OLEDropHasData = 1
>	LOCAL cTextData
>	cTextData = oDataObject.GetData(1)
>	IF NOT EMPTY(m.cTextData)
>		This.Caption = m.cTextData
>	ENDIF 
>ENDIF 
>

>
>To demo, I run the form, type something into the textbox, then highlight the text and drag it. When I drag over the checkbox, I see a copy icon, as expected. When I drop, the checkbox caption changes to the highlighted text. All great.
>
>Then, I try to close the form. I have a Close button on the form; does nothing. Ditto for the window's native close button. If I use the Design Mode button on the Standard toolbar, I get the error message I cited above. Closing the form requires CLEAR ALL.
>
>If I put the same code in the Form's OLEDragOver and OLEDragDrop methods, and set OLEDropMode to 1 for the form, no problem; the form caption changes and the form can close. Ditto if I add a command button and configure it the same way.
>
>Oh, one more thing. If I comment out the line that sets OLEDropHasData, it no longer changes the caption, but the form closes.
>
>So, anybody seen it before? Anybody able to replicate so I know I'm not nuts.
>
>Tamar

Tested so far: not working behavior replicated on check boxes and radio buttons; working behavior observed on labels, text boxes, and edit boxes. Changing OLEDropHasData back to its default state does not seem to make any effect.

Side note: I'm experimenting with prg based class. Editing the class source code and releasing the objects from memory at the IDE prompt successfully closes the form (no need to CLEAR ALL).