Expandable/Collapsable Grid - Ext JS

Has anyone attempted to create a grid that has an expand/collapse feature attached to a row? This is kind of a tree/grid hybrid alla MS Project Schedule where expanding the row would reveal hierarchical grid data related to that parent row within the grid.

Here's an example under the Task Name column. Ignore the right side, which reveals the GAANT Chart.

# 2   03-11-2007, 04:08 PM

It has already been suggested here: http://www.yui-ext.com/forum/viewtopic.php?t=3209