How to сreate a сustom Edit Appointment form using the MVVM pattern

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I have an issue with using this example to commit the changes to my custom field back to the MS SQL Server database.  I am utilizing a design structure that is not represented in the examples from DevExpress.  I am using a LINQ to SQL class as my data model, and View Models to bind to those models.

Since I am unable to use the LINQ .CommitChanges method from the custom appointment form since I cannot send it as a parameter to the constructor using this example.  My View Model reflects the changes made by the form since it is bound two ways, but I have no way to fire off the .CommitChanges method.  

I noticed there is a ..

<Button x:Name="btnOk"
               Content="OK"
               Command="{Binding SaveAppointmentCommand}" MinWidth="75" Margin="6,0,0,0"/>

But this command is not used in the example.  I have not delved into commands yet, is there an example I can use that would allow me to fire off a method in the View Model this is bound too in order to commit changes to the database?