By default all open files in your netbeans are displayed in a horizantal tab, just like a browser does.
I want my tabs to be listed vertically, is this possible?
Clicking on CTRL + 2 will open the Files Tab.
Click on the tab of one of the source files without releasing the mouse button (and without holding any additional keys), and drag toward either the right side of the editing area, or toward the bottom of the editing area (depending on whether you want them side-by-side or stacked).
To make Netbeans tab for 4 spaces: press "Tools" -> "Options" -> "Formatting". There should be a text field "Tab size" to set the tabbing size (see image bellow).
Tools -> Options -> Appearance -> Tab placement
It looks like the functionality you require was added to the NetBeans sources only a few weeks ago. You can view this changeset here: http://hg.netbeans.org/main/rev/e36924dd340d
So you should be able to set the tab positions in the Options
if the version of the IDE you have was built after the change mentioned above (25 Jan 2012).
You can get the nightly builds here.
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