private void SaveClick(object sender, RoutedEventArgs e)
{
Microsoft.Win32.SaveFileDialog saveDialog = new Microsoft.Win32.SaveFileDialog();
saveDialog.DefaultExt = ".graph";
saveDialog.Filter = "Text files (*.txt)|*.txt|All files (*.*)|*.*";
saveDialog.Title = "Save graph to a file";
Nullable <bool> result = saveDialog.ShowDialog();
if (result == true && saveDialog.FileName != "")
{
core.SaveGraph(saveDialog.FileName);
}
}
