I am sending you a project just to make sure that we are doing the same thing.
The RadComboBox DropDown closes when the focus is lost. So if you just navigate with the mouse outside of the combobox, the focus is still in the RadComboBox and this will not close it. Clicking outside the RadComboBox should work.
Can you confirm that you are getting the focus out of the RadComboBox and the DropDown does not close?
the Telerik team
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