The attached program creates a simple TreeView. If you select an item in the TreeView and repeatedly hit the left-arrow key, then the sections of the TreeView will close and eventually the whole TreeView will disappear. If you hit the right-arrow key just after the TreeView disappears then it comes back again, but if instead you hit left-arrow again then the TreeView is gone forever. It appears that the left-arrow is causing the invisible root node to be closed. When showRoot is true, there is no problem because you can just click on the root to open it again. But when showRoot is false you are out of luck. Closing the root node is not possible with the mouse in this case, and it should not be possible with the arrow keys either.