How to Prevent SelectionChange in Silverlight DataGrid

Question

I'm using a Silverlight 3 DataGrid control and have set the SelectionMode to Extended. The DataGrid takes care of managing the extended selection for me in an almost perfect manner out of the box, but a key piece of the logic is interfering with me.

I have a cell that can function as a drag and drop thumb and initiate a drag operation but users want to do a series of shift or control clicks to set a selection followed by a click and drag on one of the selected rows to initiate the drag.

The problem is that the click and drag at the end of this series causes the selection to be set to only the row that was clicked. I've poked around for ways of conditionally preventing the DataGrid from changing selection, but can't seem to find anything that works.

Does anyone have any ideas for preventing selection from changing?

Answer 1

I need an answer on this too. I'm using a DataGridTemplateColumn with a checkbox. I want to allow the user to "check" a checkbox without selecting the row the checkbox is in...