Hi Pawz,
Thank you for pointing this out for us. Indeed, adding anything but
RadListBoxItem in the
RadListBox.Items collection caused throwing such exception. We have already added refactored
RadListBox (and respectively
RadComboBox) to be capable of adding any descendants if
RadItem. We will introduce this behavior in the upcoming Q3 2007 Service pack version, scheduled next week. Note that you will still not be able to add
RadItem instances as this is a base class. Instead you should use descendants of this class.
Feel free to contact us if you have other questions.
Greetings,
Georgi
the Telerik team