adding PDE custom SourceLookupDirector

ui/org.eclipse.pde.ui/plugin.xml

diff --git a/ui/org.eclipse.pde.ui/plugin.xml b/ui/org.eclipse.pde.ui/plugin.xml
index dc47055..abd2d68 100644
--- a/ui/org.eclipse.pde.ui/plugin.xml
+++ b/ui/org.eclipse.pde.ui/plugin.xml
@@ -1977,6 +1977,7 @@
       <launcher

             class="org.eclipse.pde.internal.ui.launcher.EquinoxLauncher"

             id="org.eclipse.pde.ui.EquinoxLauncher"

-            name="%Equinox.shortcut.label"/>

+            name="%Equinox.shortcut.label"

+            sourceLocatorId="org.eclipse.pde.ui.launcher.PDESourceLookupDirector"/>

     </extension>

 </plugin>