items

Using SWT.PUSH results in the same behavior as the unsupported
SWT.Activate. To test, start a runtime Eclipse and right-click on the
icon of the active perspective in the perspective switcher in the
toolbar.

Change-Id: Id5129c9fcaa575dd19a81244f1386d2024751906
Signed-off-by: Lars Vogel <Lars.Vogel@vogella.com>