A value indicating whether group area is visible. Group area is used to display headers of groupped columns. User can drag columns from/to group area by dragging column headers with mouse, if allowColMoving option is on.

//値を取得する
var value; //タイプ： boolean
value = $(".selector").c1gridview("option", "showGroupArea");

//値を設定します
var newValue; //タイプ： boolean
$(".selector").c1gridview("option", "showGroupArea", newValue);

var showGroupArea : boolean;

// Set showGroupArea to true to display the group area.
$("#element").wijgrid({ showGroupArea: true });