XAML Datagrid，选择值但仅适用于某些列

Below is some code that almost works how I want. I am trying to get it so you click on a row and I take the programID and use it elsewhere, this part works. However I want nothing to happen if I click on the status column which has a built in combobox, how so i restrict it from using this column? I am using MVVM if that is needed Below is some code that almost works how I want