Our RadComboBox control does not offer the desired behavior out-of-the-box.
However, you could review the checkbox functionality
of our RadDropDownTree
control and see if it fits your needs. You could customize the input field text by handling the OnClientEntryAdded
event. You could calculate the length of the entries text and set it in the input field in the "n selected" format if it exceeds certain max length.
If the RadDropDownTree control does not meet your requirements, please give us some more details on the desired implementation of the RadTreeView within a RadComboBox. Do you need the tree to be an ItemTemplate within the combo or something else?
Do you need help with upgrading your ASP.NET AJAX, WPF or WinForms projects? Check the Telerik API Analyzer
and share your thoughts.