# I have the following class:

class BlockHider (ControlBlocks.StaticText):
    blockToHide = schema.One(Block.Block, doc=
        """
        The block to hide/show when clicked
        """)
    def instantiateWidget (self):
        import pdb;pdb.set_trace()
        # add a "-"
        originalTitle = self.title
        self.title = u'-%s' % self.title
        widget = super(BlockHider, self).instantiateWidget()
        widget.Bind(wx.EVT_LEFT_DOWN, self.onLeftClick)
        self.title = originalTitle
        return widget

    def onLeftClick(self, event):
        import pdb;pdb.set_trace()
        if self.blockToHide is not None:
            self.blockToHide.isShown = not self.blockToHide.isShown
            self.SetLabel(_(u'%s%s') % (self.blockToHide.isShown and "-" or "+", self.title))
            self.blockToHide.synchronizeWidget()
            event.Skip()


# and I have a funtion:

def makeHider(parcel, blockToHide, label=u'', borderTop=5, border=None,
              width=-1, textAlignmentEnum=None, **kwds):
    blocks = schema.ns("osaf.framework.blocks", parcel.itsView)
    border = border or RectType(borderTop, 0, 0, 0)
    textAlignmentEnum = textAlignmentEnum or 'Right'
    return BlockHider.template(uniqueName(parcel, 'Label'),
                               title=label,
                               characterStyle=blocks.LabelStyle,
                               textAlignmentEnum=textAlignmentEnum,
                               stretchFactor=0.0,
                               minimumSize=SizeType(width, -1),
                               border=border,
                               blockToHide=blockToHide, **kwds)

# and I call it thusly:

    showHideArea = \
        makeArea(parcel, 'ShowHideArea',
            childrenBlocks=[
                makeLabel(parcel, _(u'')),
                makeSpacer(parcel, width=8),
                makeHider(parcel, ccArea, label='cc'),
                makeSpacer(parcel, width=8),
                makeHider(parcel, bccArea, label='bcc')],
            position=0.113).install(parcel)