how to fire a button which was generated dynamically in datagrid in silverlight 4 by using mvvm patarn and galasoft dll,

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Silverlight4

eg: I have a grid with displaying firstname , last name , and in each row having delete, edit button which are generating dynamically ,by clicking on selected row , row has to be delete or Edit how can achive this if i click on edit button a child window has to pop up , i used galasoft dll and i:interaction triggers , observable collection and MVVM patern please help me .

the bellow is my .xaml code

<i:Interaction.Triggers>
<i:EventTrigger EventName="SelectionChanged">
<GalaSoft_MvvmLight_Command:EventToCommand Command="{Binding SelectionChangedRelayCommand}"
CommandParameter="{Binding SelectedItem, ElementName=DisplayGrid}"/>
</i:EventTrigger>

</i:Interaction.Triggers>

Viewmodelcode to select the row

public RelayCommand<object> SelectionChangedRelayCommand
{
get;
set;
}
public void SelectionChangedCommandExecute(object param)
{
this._StudentDtos = param as StudentDto;
EDITCmd.RaiseCanExecuteChanged();
DeleteAllCmd.RaiseCanExecuteChanged();
}