VRVijayalakshmi Roopkumar Syncfusion Team October 29, 2019 08:05 AM
Thanks for getting in touch with Syncfusion Support.
With ComboBox, we reviewed the recorded requirement and understood that you would like to add the TreeViewAdv to the ComboboxAdv control as a drop-down content. We prepared a workaround by changing the ComboBoxAdv control template to add TreeViewAdv to it as a child and binding the SelectedItem of TreeViewAdv to the content of ComboBoxAdv. Please find the sample from the below attachment. We have also attached the sample for your reference. Please download it from following link: