Updatecommand event is not working

Hi All,
I have one DataGrid and i need to use one updatecommand for updating records in DataGrid. I am using below lines. But when i am debugging it's not triggering break point is not firing at update command event. Please help me to solve this.
protected void dgAccount_UpdateCommand(object source, DataGridCommandEventArgs e) { }
private void InitializeComponent() {
 this.dgAccount.UpdateCommand += new DataGridCommandEventHandler(dgAccount_UpdateCommand);
}