You need to open the VS 2008 and click on the tool box. And say "Add tab" and give it a name. Then click the option "choose" or "Browse". You would be directed to the window which has all of the controls and also a check box beside it. You can add all of the infragistics controls you need and click ok. And you would have all of your selected tools of infragistics present in that tab.

They do not disappear.