The .NET Framework comes with a plethora of built-in controls that cover most real-world scenarios. And when we need something slightly different, we have seen that we can utilize the WPF styling and/or templating systems to adapt them to our requirements. However, there are also further ways of adjusting the built-in controls to suit our needs.
Each .NET control has a number of methods, each named with the prefix On, for example, OnInitialized or OnApplyTemplate. These are protected methods, that can be overridden in any custom class that extends a .NET control. They are called at certain points in the control's lifetime and enable us to change the default behavior of each control.
They enable us to do things ...
