void ButtonsChanged()
{
bool ok = Mode == SearchMode.Find;
spOkCancel.Visibility = ok ? Visibility.Visible : Visibility.Collapsed;
if (ok)
{
searchControl.DoubleClick += new Action(searchControl_DoubleClick);
}
else
{
searchControl.DoubleClick -= new Action(searchControl_DoubleClick);
}
}