I have a DataGrid which contains a checkbox for each item in an ObsevableCollection. At the moment I can check and uncheck the checkboxes but only one at a time. I would like to be able to select multiple rows of the DataGrid and check or uncheck the whole selection by checking one checkbox of the selected items.
I have SelectionMode="Extended" which allowed me to select multiple rows until I added the checkboxes. Now it doesn't seem to be doing anything. Can anyone help?
Thanks in advance.