//Show a form for adding a new category.
private void btnAddWCategory_Click(object sender, RoutedEventArgs e)
{
AddWordsCategory form = new AddWordsCategory(_proxy);
form.ShowDialog();
btnWordsCategoriesAct_Click(null, null);
}
//Show a form for editting category.
private void btnEditWCategory_Click(object sender, RoutedEventArgs e)
{
int id = Convert.ToInt32((sender as Button).Tag);
AddWordsCategory form = new AddWordsCategory(_proxy, id);
form.ShowDialog();
btnWordsCategoriesAct_Click(null, null);
}