private void _ClearOptions_Click(object sender, RoutedEventArgs e)
        {
            UnplannedView view = (UnplannedView)_accountsTree.SelectedItem;

            view.Options.Clear();
            view.RaisePropertyChanged("Options");
            _options.Items.Refresh();
        }
        private void _useTargetPeriod_Click(object sender, RoutedEventArgs e)
        {
            UnplannedView view = (UnplannedView)_accountsTree.SelectedItem;

            if (view != null)
            {
                if (!_useTargetPeriod.IsChecked.Value)
                {
                    view.UseTargetPeriod = false;
                }
                else
                {
                    view.UseTargetPeriod = true;
                }
            }
        }
        private void _RemoveOption_Click(object sender, RoutedEventArgs e)
        {
            UnplannedView view = (UnplannedView)_accountsTree.SelectedItem;

            if (view != null)
            {
                if (_options.SelectedValue != null)
                {
                    if (view.Options.ContainsKey(((KeyValuePair <string, string>)_options.SelectedValue).Key))
                    {
                        view.Options.Remove(((KeyValuePair <string, string>)_options.SelectedValue).Key);
                        view.RaisePropertyChanged("Options");
                        _options.Items.Refresh();
                    }
                }
            }
        }
        private void _addOption_Click(object sender, RoutedEventArgs e)
        {
            UnplannedView view = (UnplannedView)_accountsTree.SelectedItem;

            if (view != null)
            {
                if (view.Options.ContainsKey(_optionName.Text))
                {
                    MessageBox.Show("Key allready exists!");
                }
                else
                {
                    view.Options.Add(_optionName.Text.Trim(), _optionValue.Text.Trim());
                    view.RaisePropertyChanged("Options");
                    _options.Items.Refresh();
                }
            }
        }