Programming can definitely control the flow, but should not be needed if you want to use the natural order.  That order is supposed to be  Top to Bottom, Left to Right .  But sometimes the alignment may look good, but may be off by just one pixel. 

If any doubt about the alignment, you can "rubberband" the elements in each row, and use the Alignment tools in the Property Editor to make sure they are all aligned.

After rubberbanding the elements, use the Property Editor, use the tab for Position, use the "Align Vertically" selection, and choose Top, or Center, or Bottom for the edge to be aligned on.  Click on the value selected, and you should see all selected elements have been aligned.

Do one row at a time for all elements, on all tabs on the forms.