var sel=fl.getDocumentDOM().selection;
var lib=fl.getDocumentDOM().library;
fl.getDocumentDOM().selectNone();
var swapSymbolName = fl.getDocumentDOM().library.getSelectedItems()[0].name;
for(var i=0;i<sel.length;i++)
{
	if(sel[i].elementType=="instance"){
			fl.getDocumentDOM().selectNone();
			fl.getDocumentDOM().selection=[sel[i]];
			fl.getDocumentDOM().swapElement(swapSymbolName);
	}
}