protected virtual void CountryControl_Leaving(object sender, WPFUserControl.AutoCompleteTextBoxControlEventArgs e)
{
// if area control is ready only, only area of the assigned country can be selected
if (AreaControl.ListBoxReadOnly)
{
RefreshControl((e.Object as Country)?.Areas?.OfType <Location>().ToList(), AreaControl);
}
// otherwise all existing areas can be selected (or new onces can be entered)
else
{
RefreshControl(_allAreas.OfType <Location>().ToList(), AreaControl);
}
// clear old text
SubAreaControl.ClearText();
SubjectLocationControl.ClearText();
SubjectLocationLatitudeControl.Text = null;
SubjectLocationLongitudeControl.Text = null;
// derived class can set the view model property
// take country name from country object (if in database) or from UI text
SetCountryDisplayItem(e.Object as Country != null ? (e.Object as Country).Name : CountryControl.GetCurrentText());
// set focus to the respective text box
AreaControl.SetFocus();
}
