How can I correctly align widgets on Glade?

Question

I have to make three combo boxes become aligned with each other, on the right of my application, which will contain pre-defined responses to questions asked with labels on the left. However, I can not imagine a way to do this with Glade, since it insists on placing all the widgets next to each other. How can I properly align these widgets?

EDIT:

Here's an application mockup:

And here's what I have with Glade:

My intent is to make the UI in Glade at least similar to mockup UI.

EDIT (2):

There's the app widget tree:

Answer 1

Don't use a seperate grid for each label/comboboxtext, but use one grid for all of them. Also, set the x-align property of the labels to 0 for nice alignment.

Here is my attempt, just save and open in Glade.