Sets or retrieves the tooltip text in the grid column headers (header tooltip).
var value = obj.getHeaderTooltip();
obj.setHeaderTooltip(value);
obj.onHeaderTooltipChanging = function(value){...};
obj.onHeaderTooltipChanged = function(value){...};
obj.onHeaderTooltipError = function(value){...};
Single header cell
obj.setHeaderText("header text", 0);
obj.setHeaderImage("favorites", 0);
obj.setHeaderTooltip("tooltip text", 0); // header tooltip, column-0
Array of tooltips (row)
obj.setHeaderText(textArray);
obj.setHeaderImage(imageArray);
obj.setHeaderTooltip(tooltipArray); // header tooltips, array
Grid templates: header
Header model: text, image, link, value, data, format
Tooltip properties: cell, selector, footer, top, bottom