there is a line in all velocity template files. for example :
controlHeader ($action $field.id $i18n.getText($field.nameKey) $fieldLayoutItem.required $displayParameters.get('noHeader'))
i want to know the meaning of this..
First, I should point out that you've lost a # at the beginning of controlHeader - you really need to be careful with things like that, it can confuse the question.
Anyway #controlHeader is a velocity macro - you can find the definition in the macros.vm file. Simply put, the #controlHeader prints out some HTML (with some conditions) which wraps around your custom field
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