How to disable unselect row in NSOutlineView

I have NSOutlineView and I don't know how to disable unselect row in it. It's problem when I click into NSOutlineView where isn't any cell, selected row is unselected. Is there any way, how to keep selected row when someone click into NSOutlineView? But It has to work normally when someone click onto other cell. Thanks.

Solution

In Interface Builder go to the Attribute inspector, under the Table View section make sure Empty is not checked.

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