def __init__(self, tree_view):
from sugar.graphics.palette import CellRendererInvoker
self._buffer = _IconBuffer()
self._buffer.cache = True
self._xo_color = None
self._fill_color = None
self._stroke_color = None
self._prelit_fill_color = None
self._prelit_stroke_color = None
self._palette_invoker = CellRendererInvoker()
gobject.GObject.__init__(self)
self._palette_invoker.attach_cell_renderer(tree_view, self)
self.connect('destroy', self.__destroy_cb)
