Disable specific datagrid cells with binding

I am trying to associate a list of user data objects with a data network and perform the following behavior.

• Mesh filling
• Disable specific cells based on object data.

Consider the following DataGrid

<DataGrid ItemsSource="{Binding Path=CustomObjectList}">
    <DataGrid.Columns>
        <DataGridTextColumn Binding="{Binding Path=FieldName}"
                            Header="Field Name"
                            IsReadOnly="True" />
        <DataGridCheckBoxColumn Binding="{Binding Path=Compare}"
                                Header="Compare" />
        <DataGridTextColumn Binding="{Binding Path=Tolerance}"
                            Header="Tolerance" />
    </DataGrid.Columns>
</DataGrid>

With a support object like this ...

public class CustomObject: BaseModel
{
    private bool _compare;

    private bool _disableTolerance;

    private string _fieldName;

    private bool _mustCompare;

    private double _tolerance;

    /// <summary>
    /// Gets or sets the compare.
    /// </summary>
    /// <value>The compare.</value>
    public bool Compare
    {
        get
        {
            return this._compare;
        }
        set
        {
            this._compare = value;
            this.NotifyPropertyChange("Compare");
        }
    }

    /// <summary>
    /// Gets or sets the disable tolerance.
    /// </summary>
    /// <value>The disable tolerance.</value>
    public bool DisableTolerance
    {
        get
        {
            return this._disableTolerance;
        }
        set
        {
            this._disableTolerance = value;
            this.NotifyPropertyChange("DisableTolerance");
        }
    }

    /// <summary>
    /// Gets or sets the name of the field.
    /// </summary>
    /// <value>The name of the field.</value>
    public string FieldName
    {
        get
        {
            return this._fieldName;
        }
        set
        {
            this._fieldName = value;
            this.NotifyPropertyChange("FieldName");
        }
    }

    /// <summary>
    /// Gets or sets the must compare.
    /// </summary>
    /// <value>The must compare.</value>
    public bool MustCompare
    {
        get
        {
            return this._mustCompare;
        }
        set
        {
            this._mustCompare = value;
            this.NotifyPropertyChange("MustCompare");
        }
    }

    /// <summary>
    /// Gets or sets the tolerance.
    /// </summary>
    /// <value>The tolerance.</value>
    public double Tolerance
    {
        get
        {
            return this._tolerance;
        }
        set
        {
            this._tolerance = value;
            this.NotifyPropertyChange("Tolerance");
        }
    }
}

And you can consider CustomObjectList populated this way ...

this.ComparisonsAndTolerances.Add(new ComparisonSettingsTolerances()
{
    FieldName = "Alpha",
    Compare = true,
    MustCompare = true,
    Tolerance = 0,
    DisableTolerance = false
});

this.ComparisonsAndTolerances.Add(new ComparisonSettingsTolerances()
{
    FieldName = "Bravo",
    Compare = true,
    MustCompare = false,
    Tolerance = 0,
    DisableTolerance = true
});

So, of course, the FieldName, Compare, and Tolerance properties are correctly populated in the grid.

However, what I would like to achieve when MustCompare is true is that this cell is marked as read-only. And when DisableTolerance is true, this cell is marked as read-only.

Obviously, this will vary from cell to cell and row to row with 4 different combinations, but I was hoping to achieve this by binding.

I tried

IsReadOnly="{Binding Path=MustCompare}"

and

IsReadOnly="{Binding Path=CustomObjectList/MustCompare}"

But not one of them worked.

.