Hello Rod,
The scenario that you try to implement is rather custom.
When you enable the RadComboBox at client-side – please enable the RadTreeView and its nodes as well. Additionally - if you set the text of the first item of the RadComboBox - in fact you “replace” the RadTreeView.
In order to make the RadComboBox “remember” the selected text please set the AllowCustomText property of the control to “true” then at OnClientLoad event you can forbid user typing in the control input in this way:
Please find more details at the sample attached.
Best wishes,
Kalina
the Telerik team
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