Why does insertion location into GridLayout differ based on inputs?

Hello,
I wrote a loop that inserts a run-time determined number of checkboxes into a GridLayout.
For instance, if the user wants 5 checkboxes (decided at run-time), then the program creates 5 new checkboxes and inserts them into a (5 rows, 1 col) grid.
The checkboxes appear correctly as 5 rows and 1 column.
However, if the user wants a lot of checkboxes, (ex: user wants 10 checkboxes), then the program inserts the checkboxes in the wrong order.
Instead of
1
2
3
4
5
6
7
8
9
10
It inserts like this:
1 2
3 4
5 6
7 8
9 10
Notice how the checkboxes appear in a (5 row x 2 column) grid.
I dont know why the exact same lines of code [code that generates a (user defined number of rows x 1 column)] create two different layouts based on the size of the input.
I ONLY want to have ONE column, no matter how many lines of input. I put a JScrollPane on the panel that has the GridLayout because the i know that a lot of checkboxes wont be able to fit entirely on that one little section that has the GridLayout panel.
Can anyone explain why the output differs based on the input?

The following quote from the API documentation for GridLayout may help you understand what's happening:
"When both the number of rows and the number of columns have been set to non-zero values, either by a constructor or by the setRows and setColumns methods, the number of columns specified is ignored. Instead, the number of columns is determined from the specified number or rows and the total number of components in the layout. So, for example, if three rows and two columns have been specified and nine components are added to the layout, then they will be displayed as three rows of three columns. Specifying the number of columns affects the layout only when the number of rows is set to zero."

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http://help.sap.com/saphelp_nw04/helpdata/en/95/bb623c6369f454e10000000a114084/frameset.htm
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