public void DidChangeValue(RenameDialog dialog, string value)
{
if (controllerDelegate != null)
{
int selectedIndex = controllerDelegate.GetIndexOfSelectedItem(this);
string originalValue = controllerDelegate.GetTitleForItemAtIndex(this, selectedIndex);
if (!controllerDelegate.IsNameAvailable(this, value) && value != originalValue)
{
dialog.ShowErrorMessage("This name is already used.");
}
else
{
dialog.ResetErrors();
}
}
}