private void Add_Click(object sender, RoutedEventArgs e)
{
ViewableTreeNode selected = nodeList.SelectedItem as ViewableTreeNode;
string word = wordBox.Text;
if (selected == null)
{
MessageBox.Show("You must select a parent before adding a word");
}
else if (string.IsNullOrEmpty(word))
{
MessageBox.Show("You must enter a word to add to the tree");
}
else
{
tree.Add(selected, word);
wordBox.Text = "";
}
}
