I just did a test RC file using a static control, an edit control and a button, all lined up horizontally and with the static control, you can ajust the horizontal alignment by changing the height of the control in relation to the edit control but the button is harder to align to the edit control as you don't easily have an accurate way to ajust the height location, IE the top edge.
I can tweak the position coordinated manually in the right side list which gets the location close.