The panelList component outputs each visible child in a list with a bullet next to it. The list can be split into columns. This is done by setting the "rows" attribute. This is the multiple of children at which to add another column. For example, if the "rows" attribute was set to 6 then if there were 1-6 visible children there would be one column, 7 to 12 visible children there would be 2 columns, and 13+ visible children would be shown in 3 columns. The number of columns is determined by the value set for "maxColumns" attribute. So if there were 100 visible children with "rows" set to 30 and "maxColumns" was set to 3 children, there will be 3 columns (and 34 rows). If "rows" attribute is not specified, all visible contents will be in one column. The "maxColumns" that can be set is dependent on the type of Agent. If the value set for "maxColumns" is greater than the default for the agent, then it is defaulted. The default maxColumns value is 2 for the PDA. Children are not displayed/rendered if value of "maxColumns" or "rows" is less than one. The split is based solely on the number of visible children and not on their size.