In VS 2010 when you drag one control to your page (left mouse button is still clicked and cursor is on the page area) so the toolbox tab (from your left side - and auto hide) is still there and it seems auto hide not work.
But in VS 2008 everything was ok!
What is the problem about that / I am looking for this answer because when you drag something on your page you can not see the right element for dropping that control !!!
Any idea?
If you drag a control from the toolbox to somewhere within the design canvas but not onto your form, the toolbox will remain visible despite auto-hide being enabled. Notice the mouse cursor will have the "NO" symbol (circle with a line through it) while over the canvas area. Once you successfully place the control onto the form somewhere, the toolbox will auto-hide.