Sets or retrieves the number of the grid header rows. Only works with extended grid (AW.Grid.Extended), the standard grid (AW.UI.Grid) always has one header row.
var value = obj.getHeaderCount();
obj.setHeaderCount(value);
obj.onHeaderCountChanging = function(value){...};
obj.onHeaderCountChanged = function(value){...};
obj.onHeaderCountError = function(value){...};
obj.setHeaderCount(2); // 2 header rows
obj.setHeaderText("header");
Grid templates: headers
Header model: count, indices, visible, height
Count properties: row, column, header, footer