How to clear a column template?

Hi guys.... and girls,

I need to unset a column template "checkbox" that I did assigned previously with comand (c5 is the variable that contain the checkbox template definition):

grid.setColumnTemplate(c5,7);

I try to unset the template applying the following commands but anyone works:

grid.unsetColumnTemplate(7);
grid.clearColumnTemplate(7);
grid.setColumnTemplate(grid.getColumnTemplate(1),7);

Thanks in advance.
Regards.

Can anyone help me please?

I found a solution based on this other one for version 2:

http://www.activewidgets.com/javascript.forum.23264.1/how-to-set-to-remove.html

I use this code to set a template

check = new My.Templates.Checkbox;
check.setCheckedProperty('true', '1');
check.setCheckedProperty('false', '0');

grid.setColumnTemplate(check,7);

And this one to clear a template:

grid.setColumnTemplate(new Active.Templates.Text, 7);

Regards