Line :: isHeader - Heading property
The property contains true, when the current line is a region header line. Region heading lines consist of column labels, which are displayed on top of a region. In order to show region header lines, at least one column defined for the region has to be defined with the label option (show label).
When the current line is a line of a region heading line, the property returns true, false otherwise. When no list item is attached to the line, the function throws an exception.
Return value: State of function return ( bool )
A State true indicates, that the function was executed successfully. Otherwise state is false.