Coordinating radial tree plot colors

The first radial tree plot MEGAN generated, matched up each class with the same chase of colors for each family. However, every plot generated after that no longer matches up the same colors. In the example below, all the alphaproteobacteria are in shades of blue, the gammas are in green, and the betas are all in shades of pink.

But now the only plots MEGAN generates are with random colors like in the example below.

Is there a way to have color each group and sub groups in MEGAN with different shades of the same color? It so much easier to look at the data this way.

I do have code that can do that (blend color of a node with the color of its parent so has to match the colors with the hierarchy), so I will look into implementing this.