Cubase 5.1 Cutting parts ?

Hey, i have a little problem while tring to cut parts on cubase.
I recorded my guitar Trough Alesis io2. Let’s sat ther is a specific part of the recording which i don’t want, so i pick the "Object Selection " tool and mark the part. But, whenever i press leftclick, Cubase Marks whole the box.

When i opened an example of project , i try to mark a specific scene and it suddenly works?
here is a picture ao the two projects. above the example and the second is my recorded guitar.

Im sorry for being “new” in cubase, hope you understood.