Add Functionality to FeatureDataGrid

Question

I have a featuredatagrid which displays information for selected parcels.
I want to add a button to it that exports the information for the parcels that are selected in the featuredatagrid. 
I can export the info using a button but I would like to add the button to the bottom of the grid near the options button or add a menu item to the options menu. 
I have edited the control templates before but it has been to remove or change the properties of the control parts. I can also navigate down to the to the parts by editing the controls template...so my question is if I add a button...here comes the dumb part...where does the code go for the click event functionality. 
Thanks for any help or suggestions. 
Keith

KeithGanzenmuller · Answer

That worked PERFECTLY, the code found the button and executed the click event.

Thanks again to you.

DominiqueBroux · Answer

You can't call GetTemplateChild in the constructor.
You have to do it by overriding OnApplyTemplate.
Something like:Public Overrides Sub OnApplyTemplate()
  MyBase.OnApplyTemplate()
  Dim myNewButton = TryCast(GetTemplateChild("MyNewButton"), Button)
  If myNewButton IsNot Nothing Then
    myNewButton.Click += myNewButton_Click
End If
End Sub

KeithGanzenmuller · Answer

This is what the class looks like:
So far I am trying to run the code and find the button but it always returns nothing.

Public Class NewFDG
    Inherits ESRI.ArcGIS.Client.Toolkit.FeatureDataGrid
    Public Sub New()
        MyBase.New()

Dim myexportButton As Button = CType(GetTemplateChild("ExportSelectionButton"), Button)
        '    AddHandler myexportButton.Click, AddressOf myexportButton_Click
       
 If myexportButton Is Nothing Then
           MessageBox.Show("Nothing")
End If

End Sub

'Private Sub myexportButton_Click(sender As Object, e As RoutedEventArgs)
    '    MessageBox.Show("Click") 'Throw New NotImplementedException
    'End Sub

End Class