private void NewKeyValueButton_Click(object sender, RoutedEventArgs e)
{
var kvTextBox = new KeyValueTextbox();
KeyValueList.Children.Add(kvTextBox);
kvTextBox.DeleteButtonClicked += KvTextbox_DeleteButtonClicked;
}
private void KvTextbox_DeleteButtonClicked(KeyValueTextbox sender)
{
KeyValueList.Children.Remove(sender);
}