When the user selects a attribute in the Inspector and presses Space bar, the selected attribute should respond accordingly. For example, it opens the drop down list or Object Selector window. But it is unresponsive.

Repro:
1. Create a new project
2. Select "Main Camera" and find "Target Texture" in the Inspector.
3. Make sure it is selected (the text and the entry field border become blue.)
4. Press Space bar.
5. Find "Clear Flags" in the Inspector.
6. Select it (the text and drop down list border become blue)
7. Press Space bar.

Expected Result: The Space bar pressing should open Object Selector for the appropriate entry field.