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set_visible()

The method toggles the visibility of an item on and off. It takes a boolean value indicating whether the item will be visible or not.

Example:

function GridCreated() {
    var masterTable = $find("<%=RadGrid1.ClientID%>").get_masterTableView();
    var dataItem = masterTable.get_dataItems()[0]; 
    dataItem.set_visible(false);
}
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