How?
When you click on a class in the Class tree, the current class shifts to the one you selected. This would not shift the current object to that class. You would find that the class properties pane would shift to the class you now selected!

Watch-out!
This can sometimes be confusing. For example; say the current object is named bedroom and it is of the class first floor. Then you click on another class second floor. The class properties pane would now display the properties of second floor and NOT first floor So keep an eye on the name of the class that it is currently displaying – it is shown at the bottom of the class properties pane