Why af:collectionDropTarget doesnt have a clientDropListener attribute?

Hi,
I am working on drag and drop between Table and Tree component.
On Tree component, I have used *<af:collectionDropTarget* component to handle drop Listener.
Drag and Drop functionality is achieved, but once a drop is done on Tree, there is a time lapse due to Network driven activity.
I want to prevent user from doing any other activity on the screen. i.e I need a glass pane or splash screen to be displayed on drop event.
Opening a splash screen could have been achieved, if <af:dropTarget is used. As *<af:dropTarget* has clientDropListener attribute, which handles the client side popup opening activity and then redirecting to server side dropListener.
I want to achieve similar thing using *<af:collectionDropTarget* component. This component doesn't have a clientDropListener attribute.
Is there any other way to achieve this?
Please help.
Thanks,
Srikanth

Hi Frank,
The reason to use *<af:collectionDropTarget* is
*<af:dropTarget* is returning null for many options. (eg: dropEvent.getDropSite(), dropEvent.getDropComponent().getgetRowData() ).
where as,
<af:collectionDropTarget is returning proper values.
I had already tried implementing glasspane option mentioned in the link, but it didn't work in this scenario as the type specified for <af:clientListener doesn't have anything related to "drop".
<af:clientListener method="showPopup" type="..."/>.
The Tree related types available are rowDisclosure, selection, propertyChange.
rowDisclosure -> only when trying to expand,
selection -> when tree node is selected
propertyChange -> after tree node got modified (due to drag / drop)
There is nothing like 'drop' type which gets executed on drag and drop.
Regards,
Srikanth

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