Merges the instance's window group with the same window group as the specified window.
Example
var finWindowOne = new fin.desktop.Window({
url: "http://www.openfin.co",
name: "finWindowOne",
autoShow: true
});
var finWindowTwo = new fin.desktop.Window({
url: "http://www.openfin.co",
name: "finWindowTwo",
autoShow: true
});
var finWindowThree = new fin.desktop.Window({
url: "http://www.openfin.co",
name: "finWindowThree",
autoShow: true
});
var finWindowFour = new fin.desktop.Window({
url: "http://www.openfin.co",
name: "finWindowFour",
autoShow: true
});
// When finWindowOne moves or is moved, finWindowTwo moves by the same amount
finWindowOne.joinGroup(finWindowTwo);
// When finWindowThree moves or is moved, finWindowFour moves by the same amount
finWindowThree.joinGroup(finWindowFour);
// finWindowOne, finWindowTwo, finWindowThree, and finWindowFour now move together in the same group
finWindowOne.mergeGroups(finWindowThree);