parameters: (self, event)
docstring: Handles the ``wx.EVT_ENTER_WINDOW`` event for :class:`RibbonToolBar`.
  
          :param `event`: a :class:`MouseEvent` event to be processed.
docstring_summary: Handles the ``wx.EVT_ENTER_WINDOW`` event for :class:`RibbonToolBar`.
docstring_tokens: Handles the wx . EVT_ENTER_WINDOW event for : class : RibbonToolBar .
function: def OnMouseEnter(self, event):
          """
          Handles the ``wx.EVT_ENTER_WINDOW`` event for :class:`RibbonToolBar`.
  
          :param `event`: a :class:`MouseEvent` event to be processed.
          """
  
          if self._active_tool and not event.LeftIsDown():
              self._active_tool = None
function_tokens: def OnMouseEnter ( self , event ) : if self . _active_tool and not event . LeftIsDown ( ) : self . _active_tool = None