gistfile1.xml

        <menuContribution
              locationURI="toolbar:org.eclipse.ui.main.toolbar?after=additions">
           <toolbar
                 id="de.hpi3d.tracing.ui.toggleTracingToolbar">
              <dynamic
                    class="de.hpi3d.tracing.ui.handlers.DynamicToggleButton"
                    id="de.hpi3d.tracing.ui.dynamicToggleButton">
                 <visibleWhen
                       checkEnabled="false">
                    <with
                          variable="activeWorkbenchWindow.activePerspective">
                       <equals
                             value="org.eclipse.debug.ui.DebugPerspective">
                       </equals>
                    </with>
                 </visibleWhen>
              </dynamic>
              <command
                    commandId="de.hpi3d.tracing.ui.traceOverCommand"
                    icon="icons/traceOver.png"
                    id="de.hpi3d.tracing.ui.traceOver"
                    label="Trace Over"
                    style="push">
                 <visibleWhen
                       checkEnabled="false">
                    <with
                          variable="activeWorkbenchWindow.activePerspective">
                       <equals
                             value="org.eclipse.debug.ui.DebugPerspective">
                       </equals>
                    </with>
                 </visibleWhen>
              </command>
              <command
                    commandId="de.hpi3d.tracing.ui.startRevealerCommand"
                    icon="icons/devEdition.png"
                    id="de.hpi3d.tracing.ui.startRevealer"
                    label="Start Visualization"
                    style="push">
                 <visibleWhen
                       checkEnabled="false">
                    <with
                          variable="activeWorkbenchWindow.activePerspective">
                       <equals
                             value="org.eclipse.debug.ui.DebugPerspective">
                       </equals>
                    </with>
                 </visibleWhen>
              </command>
              <command
                    commandId="de.hpi3d.tracing.ui.toggleParamProbeCommand"
                    id="de.hpi3d.tracing.ui.toggleProbes"
                    label="log Parameters"
                    style="toggle">
                 <visibleWhen
                       checkEnabled="false">
                    <with
                          variable="activeWorkbenchWindow.activePerspective">
                       <equals
                             value="org.eclipse.debug.ui.DebugPerspective">
                       </equals>
                    </with>
                 </visibleWhen>
              </command>
              <control
                    class="de.hpi3d.tracing.ui.handlers.PollutingFunctionToolbar">
                 <visibleWhen
                       checkEnabled="false">
                    <with
                          variable="activeWorkbenchWindow.activePerspective">
                       <equals
                             value="org.eclipse.debug.ui.DebugPerspective">
                       </equals>
                    </with>
                 </visibleWhen>
              </control>
           </toolbar>
        </menuContribution>