private RelayCommand _createRequestCommand;
public ICommand CreateRequestCommand
{
  get
   {
       if (_createRequestCommand == null)
        _createRequestCommand = new RelayCommand(x => CreateRequest("nameRequest"));
       return _createRequestCommand;
   }
}

HideProgressBar()
{
   Dispatcher.BeginInvoke(DispatcherPriority.Background, (SendOrPostCallback)delegate 
    { 
      this.bdrProgress.SetValue(Border.VisibilityProperty, Visibility.Collapsed); 
    }, null);
} 

<Button x:Name="buttonGreen" Header="Add" Command="{Binding CreateRequestCommand}" />