/// <summary>
/// Updates the dialog to reflect the current <see cref="MapView.SelectedSite"/>.</summary>
/// <param name="updateRegion">
/// <c>true</c> to first recalculate the <see cref="MapView.SelectedRegion"/> to
/// reflect the combined movement range of all selected units; <c>false</c> to leave the
/// <b>SelectedRegion</b> unchanged.</param>
/// <remarks>
/// <b>ShowSelection</b> updates the arrows shown in the hosted <see cref="MapView"/>.
/// </remarks>
private void ShowSelection(bool updateRegion)
{
// update selected region if requested
if (updateRegion)
{
this._mapView.SelectedRegion = GetMoveRegion();
}
GameUtility.DrawMoveArrows(this._mapView,
this._selected, this._mapView.SelectedSite, true);
}