How to place column breaks in ConTeXt?

How to place column breaks in ConTeXt?

I am creating a book which mostly has a 2-column layout. I am using \startcolumns[n=2] and \stopcolumns everywhere that I need columns, which is almost everywhere, except in section titles. I need to ensure that some of the section titles appear at the top of a new column, but manually adding column breaks. In this example, a manual column break is added before the third section title, but not before other section titles.
 __________________ __________________
|                  |                  |
| Chapter Title    | .......  Section |
|                  | .......  ....... |
| Section  ....... | .......  ....... |
| .......  ....... | .......  ....... |
| .......  Section | .......  ....... |
| .......  ....... |          ....... |
| .......  ....... |          ....... |
| .......  ....... |          ....... |
| .......  ....... |          ....... |
|__________________|__________________|
How can I add a column break to my document?