Phantom scrolling on a Flex Tree

I found a Flex pearl:

After quite sometime investigating a problem related to the Tree component in Flex I found a nice and easy solution.

The problem:

In a Tree with custom drag and drop functionality and where some handlers would require a "preventDefault()" call on the triggered event, after a drop of an item in the Tree with enough items to show a vertical scroll bar the Tree would scroll responding to the mouse move even after the drag action was completed.

The solution:

found at http://www.boxertech.com/blog/post/Flex3-Uncontrolled-Auto-Scroll-after-DragDrop.aspx

Basically the Tree's default dragDropHandler, and I believe all list based components with drag & drop functionality, will not reset the drag scrolling if the default behaviour of the event was prevented.

A quick override of the default method to fix the problem. Simply extend Tree if you haven't done so already.

Example:

override protected function dragDropHandler( event : DragEvent ) : void

{

event.target.mx_internal::lastDragEvent = null;

event.target.mx_internal::resetDragScrolling();

if( event.isDefaultPrevented() )

{

return;

}

super.dragDropHandler( event );

}

Thanks to the author of the WILK blog, though of help propagating the solution would be nice.

Hope it helps people find the solution faster than me ;)