So u've already noticed that these close, maximize and minimize buttons sometimes are on the left side bugging you when you are using some themes. Well... Problem solved. With this little tweak you can modify their location when using any theme you like =D
Follow the following Steps:
1. Press Alt+F2 to Open the Run Application Window.
2. Type "gconf-editor" then click Run like the screenshot below.
2. Type "gconf-editor" then click Run like the screenshot below.
3. Expand to apps -> metacity -> general from the side pane then double click "button_layout" and change the text to "menu:minimize,maximize,close" then hit enter.
4. Done =D