There are a number of issues with the add resources combobox, in the Resources panel:

• Selecting a result in search does not create the resource, I need to select result, then click the TextBox input again, and press enter.
• The ComboBox dropdown/content menu does not go away when clicking outside of it.
• The ComboBox is not disabled when no ResourceDictionary is selected.
• Selecting an element in the Navigator does not select it in the Resources panel, instead you need to re-select it in order to see or add to it's resources.