Glitch in TreeListView when dragging with SelectionMode="Extended"

[Jerome]

Hi!

It is nearly impossible to use drag-and-drop in a TreeViewList with extended selection enabled.

Here is how to reproduce the glitch :
- move the mouse over an unselected tree item
- press and hold the left mouse button
- move the mouse over other items without releasing the button

The drag-and-drop is properly initiated, but all the items over which the mouse moves during the drag-and-drop become selected. As a result, the drop operation is applied to the wrong set of items!

I have spent a lot of time and effort trying to work around that glitch, to no avail. Is there a fix on the way?

(experienced with RadControls_for_Silverlight_4_2011_1_0419_Dev)

Regards,
Jerome

[Milan]

Hi Jerome,

Drag and drop and Extended selection (with mouse) are not compatible - you should sacrifice one of those feature to get a consistent behavior. 

For example, setting DragElementAction to None should resolve the problem. 

Kind regards,
Milan
the Telerik team

[Jerome]

Hi Milan!
Thank you for you reply.
Do you know if there is any plan to make those features compatible in a future release?

Regards,
Jerome

[Milan]

Hi Jerome,

I am afraid that extended selection and drag and drop are inherently incompatible. Still, we will consider options to provide better user experience.

All the best,
Milan
the Telerik team