Where to place child control event handler logic in MVVM ?

Hi Experts,

Im new to WPF and so MVVM.

I have created a user control with a DataGrid and im invoking this user control from another WPF form and within that main form i'm setting the data context and grid in the child (user control) populates correctly. what i need is,

I have attached attributes to the binding collection which holds the actual column header text

ex : 

[HeaderName("Email Address")]
public string Email { get; set; }

using reflection I should iterate through the property attributes and get the actual header name and customize the grid. 

this can be easily done within datagrid's ColumnGenerated event handler. But my problem is where this logic should go in in a MVVM application ? if this logic should go to some other class how can i place datagrid's ColumnGenerated event in another class ?

appreciate your help on this.