In our diagrams we have implemented an edit mode. We do this by locking the items inthe diagram. When we do this the links are very flakey and intermittent when being selected. If I attach a debugger and watch the events during the link clicked event the link is selected but when it gets to selected item changed event the link is no longer selected. This is something that used to work but now doesn't after upgrading to version 2.3 of the control and version 4 of Silverlight. Any ideas of why this would happen and is there a different way to lock the items. We still want the user to be able to select the items even though they can't edit them.