Hi Michael, finally I solve it, thank you. Use of MultiDataTrigger in DataCell style was solution. Now it works as expected. Here is that style when somebody needs similar functionality:<!--force readonly of cell when its data are not editable--><Style TargetType=''{x:Type ...

  I am trying to set the ReadOnly Property of a DataCell based on the value in the DataCell being equal to the value in an ordinary TextBox outside of the DataGrid.   This is what I am trying to implement:   <Style TargetType=''{x:Type xcdg:DataCell}''> <Setter Property=''ReadOnly'' Value=''False'' ...