What is a CheckBox Group?
Image to have same checkbox in a form and each one can be a category, and you need the user choose minimum one or more category. With this behavior you define a group of checkbox and validate toghether to be sure the user check what you need.
To create a group of checkbox you must insert in your form some standard checkbox and add to them the special attribute dwzGroup
<input name="chk_1" dwzGroup="CheckGroup" type="checkbox" id="chk_1" value="1" />
<input name="chk_2" dwzGroup="CheckGroup" type="checkbox" id="chk_2" value="2" />
<input name="chk_3" dwzGroup="CheckGroup" type="checkbox" id="chk_3" value="3" />
the valur of the dwzGroup special attribute is the Name of the Group and in the behavior fields panel you will find a single line for all this checkbox with the value of the dwzGroup attribute in the Field name column.
Is not required the checkbox is checked.
In this case you don't need define a group!
One of them:
The user must check minimun of checkbox of the group
Checked Min. Max.:
You can define a mininum and a maximun checkbox the user must check
The message display if the field is not validated