WIthout use of any plug ins, you can just drag and drop into a container field with the same size and look as the popover button. OnObjectModify can then be dripped by the drop and run a script that opens the actual popover,
HI Phil thanks for your comment. What you describe is opening a popover by drop- but I want to drop the file inside the popover because opening and closing works as starting and stopping the drop area which is created by plugin. I don't want a tiny drop area of the size of the button too.
It can be pretty much any size you need. I described making it look like the popover button because I thought that was what you needed. And you won't need a plug in for this method.
I know what you mean and this is a way but I don't need a popover like this because the drop triggers the popover to open. But I want the mouseover to trigger the opening. I think you got me wrong somehow.
I want to achieve a similar effect to dragging a file through the Mac Finder. On Hover(while dragging a file) the folder will open and you will be able to dive deeper while still holding the file for a later drop.