New Post: Strange Selector Issue in DataGrid

We have a DataGrid (the one that comes with .NET) that contains a variety of template columns. What we're finding is that clicking on a cell in a different row from the currently selected row exhibits inconsistent behavior with respect to the selected row indicator. For example, if the cell contains a TextBox, the selected row indicator follows. However, if the cell contains a DoubleUpDown (from the "Extended WPF Toolkit"), the selected row indicator does not follow. I'd really like to have the selected row indicator follow the selection! Any idea why this is happening and how I can fix it?

Thanks!
Brad.