Rooting a tree in MEGA

Question

[andre.arrudalima]

Hello, just made a tree in MEGA. I used Neighbor-joining tree and boostrap method with 1000 replicates. This is the result

I used BAK1 as a outergroup. I wish to make a rooted tree, with bootstrap values that also sustain the innergroup (notice the absence of a number in the innergroup first bar). When I try to root the tree after, in the Tree Explorer, it puts BAK1 as a outergroup, as you see in the image, but it don't root the tree in a sense of putting a bar there.

So, in a few words, I would like to root that tree with bootstrap number suporting the innergroup.

Thank you