Row Span for project control UI

[heavenite]

I want to implement a project control grid, just as attached image shows.

1. How to make the cell span for two row.

2. How to use colored grid cell to indicate the mile stone and project status?

[Isomorphic]

This could be done based on either the CubeGrid widget or the (unreleased) Timeline widget - each would need some small enhancements that you could sponsor.

Alternatively, consider creating this as two adjacent ListGrids, where you are making rows twice as tall in the ListGrid on the left, and the ListGrid on the right is using headerSpans.