Sets or retrieves the tooltip text in the grid footer row (footer tooltip).
var value = obj.getFooterTooltip();
obj.setFooterTooltip(value);
obj.onFooterTooltipChanging = function(value){...};
obj.onFooterTooltipChanged = function(value){...};
obj.onFooterTooltipError = function(value){...};
Single footer cell
obj.setFooterVisible(true);
obj.setFooterText("footer text", 0);
obj.setFooterImage("favorites", 0);
obj.setFooterTooltip("tooltip text", 0); // footer tooltip, column-0
Array of tooltips (row)
obj.setFooterVisible(true);
obj.setFooterText(textArray);
obj.setFooterImage(imageArray);
obj.setFooterTooltip(tooltipArray); // footer tooltips, array
Grid templates: footer
Footer model: text, image, link, value, data, format
Tooltip properties: cell, selector, header, top, bottom