Help deleting purchased music off iphone 4?

I have latest Itunes installed on windows 7 desktop 11.0.5.5 and i can't seem to delete purhcased music off my iphone when it is connected to the desktop, there's no X nor when you do a control or shift and select all the songs then go to edit the Delete selection is grayed out.

Added (1). I wish it was that simple it isn't this time around! It was like that before.

I believe you have to go to your itunes library on your computer while itunes is open and uncheck the songs that you want deleted off your iphone.once you have unchecked those songs you click the sync button. All while your phone is connected to your pc of course.

Deleting music purchase or none purchase is as easy as going to the song and sliding your finger to the Left, you will see a red delete icon on the right click it and your song is deleted.
Peace and good luck.