visibleWhen on toolbar in Eclipse

I have added visibleWhen directly under toolbar, look like platform is not respecting visibleWhen for toolbar.

This is how I defined the extension:

<extension
       point="org.eclipse.ui.menus">
    <menuContribution
          allPopups="false"
          locationURI="toolbar:org.eclipse.ui.trim.vertical2">
       <toolbar
             id="com.kk.toolbar2"
             label="Charm bar">
          <command
                commandId="com.kk.command.showhelp"
                icon="icons/help.gif"
                label="Help"
                style="push">
           </command>
<visibleWhen
                   checkEnabled="false">
                <test
                      forcePluginActivation="true"
                      property="com.kk.isKKPerspective"
                      value="true">
                </test>
        </visibleWhen>
            </toolbar>
    </menuContribution>
 </extension>


visibleWhen has no effect on toolbar
https://bugs.eclipse.org/bugs/show_bug.cgi?id=201589


Workaround for this problem is, adding visibleWhen for each command. 
By adding visibleWhen on each command, toolbar is automatically getting disappeared if there are no visible elements

In my case, I want to add add a righside trim toolbar with some tool items. But I wanted to show this only in my perspective 'KKPerspective'.

<extension
       point="org.eclipse.ui.menus">
    <menuContribution
          allPopups="false"
          locationURI="toolbar:org.eclipse.ui.trim.vertical2">
       <toolbar
             id="com.kk.toolbar2"
             label="Charm bar">
          <command
                commandId="com.kk.command.showhelp"
                icon="icons/help.gif"
                label="Help"
                style="push">
             <visibleWhen
                   checkEnabled="false">
                <test
                      forcePluginActivation="true"
                      property="com.kk.isKKPerspective"
                      value="true">
                </test>
             </visibleWhen>
          </command>
            </toolbar>
    </menuContribution>
 </extension>

   <extension
         point="org.eclipse.core.expressions.propertyTesters">
      <propertyTester
            class="com.kk.KKPerspectiveTester"
            id="com.kk.propertyTester2"
            namespace="com.kk.propertyTester2"
            properties="isKKPerspective"
            type="java.lang.Object">
      </propertyTester>
   </extension>