// Select zone
private void comboBoxZone_SelectedIndexChanged(object sender, EventArgs e)
{
if ((string)(sender as ToolStripComboBox).Items[(sender as ToolStripComboBox).SelectedIndex] != "")
{
editorControl.ChangeZone((string)(sender as ToolStripComboBox).Items[(sender as ToolStripComboBox).SelectedIndex]);
}
levelDisplay.Focus();
}