A Grid extension that allows to visualize a hierarchical container. This is an experimental add-on, because I do not know what will be its value for the end-user. Right now it has minimal set of features - basically just showing the tree structure in a grid. I would like to figure out do people need it and if yes continue developing and fixing bugs. Please try it out and comment. Known issues that are not supported: - Sorting does not take into account the hierarchical structure. Just plain sorting. - Hiding the column with expand button, does not create the expand button for the next first visible column.