I would like to allow a user to select a region of interest on an image. Is there any way to get the coordinates of the polygon drawn using the LassoSelectTool on an image? The BoxSelectTool can take a callback function as an argument, but the LassoSelectTool has no such functionality. I’ve attached an image of an error that occurs in the JS console when attempting to use the LassoSelectTool on an ImageRGBA glyph. I am using Bokeh 0.10.0. Any help is appreciated.