New Post: CheckComboBox: Setting "Delimiter" to anything other than a comma

I have updated the title of this discussion following some further discovery...

If I change the Delimiter property of the CheckComboBox back to a comma (","), and make the corresponding changes within the model, the control works as expected. If I try and set the delimiter to anything other than a comma (I say anything, I have tried a space, a colon and a forward slash), the control does not work any more.

Working (updates to above)...

public class Model {
    public String Surcharges {
        get { return (this.surcharges ?? String.Empty).Replace(@" ", @","); }
        set { this.surcharges = (value ?? String.Empty).Replace(@",", @" "); }
    }
}

<et:CheckComboBox Delimiter=","
    DisplayMemberPath="PalletNetworkSurchargeCode"
    ItemsSource="{Binding Path=SurchargeOptions}"
    MinWidth="150"
    SelectedValue="{Binding Path=Surcharges}"
    ValueMemberPath="PalletNetworkSurchargeCode" />

Not working (similar updates to the above)...

public class Model {
    public String Surcharges {
        get { return (this.surcharges ?? String.Empty).Replace(@" ", @"/"); }
        set { this.surcharges = (value ?? String.Empty).Replace(@"/", @" "); }
    }
}

<et:CheckComboBox Delimiter="/"
    DisplayMemberPath="PalletNetworkSurchargeCode"
    ItemsSource="{Binding Path=SurchargeOptions}"
    MinWidth="150"
    SelectedValue="{Binding Path=Surcharges}"
    ValueMemberPath="PalletNetworkSurchargeCode" />