T5: Why value of CheckBox get lost at validation result page

[jeffrey ai <jf...@gmail.com>]

Hi Folks,

I have a form with some TextField and CheckBox.
I add the onValidate() method into the page to do my own page page
validation like below:
===
	void onValidate()
	{
		if ( .... )
			_tracker.recordError( "validation error..." );
	}
===

The data in the action request get correctly validated, and the validation
error message shows up in the result page.
However, all values of CheckBox get lost, at the mean time, all values of
TextField are still there. 

The way I found to get around this problem is make all CheckBox fields
Persist("flash").

The same problem applies to Select component too.

Is this a problem? Why it's happening? Is my walk-around of this problem
good?

Thanks,
Jeffrey Ai
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