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var colName = $("#groupList").val();     
var group = colName ? gridView.columnByName(colName) : null;
if (group) {
    var orientation = gridView.getColumnProperty(group, "orientation");
    orientation = (orientation == "vertical") ? "horizontal" : "vertical";
    gridView.setColumnProperty(group, "orientation", orientation);
}

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var colName = $("#groupList").val();     
var group = colName ? gridView.columnByName(colName) : null;
if (group) {
    var header = gridView.getColumnProperty(group, "header");
    header.visible = !header.visible;
    gridView.setColumnProperty(group, "header", header);
}

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var colName = $("#groupList").val();     
var group = colName ? gridView.columnByName(colName) : null;
if (group) {
    var hide = !gridView.getColumnProperty(group, "hideChildHeaders");
    gridView.setColumnProperty(group, "hideChildHeaders", hide);
}

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var colName = $("#groupList").val();     
var group = colName ? gridView.columnByName(colName) : null;
if (group) {
    var width = gridView.getColumnProperty(group, "displayWidth") + 10;
    gridView.setColumnProperty(group, "displayWidth", width);
}

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var colName = $("#groupList").val();     
var group = colName ? gridView.columnByName(colName) : null;
if (group) {
    var width = gridView.getColumnProperty(group, "displayWidth") - 10;
    gridView.setColumnProperty(group, "displayWidth", width);
}