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Save State through GetFormElements
If you set GetFormElements to True the control will get the latest state
of all form elements. Otherwise it will get the initial settings of form elements.
The trade-off is between working with the latest state and performance based on
the number of elements transferred with each callback request.
In this example, having it turned on will let you add to total incrementally. If
you turn it off total will always be 1 since it keeps getting the initial state.
Note that form elements are input, select and textarea. If you also want to keep
the latest state of non-form elements such as label you can achieve this by using
an additional hidden form element.
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