MultiSelection of records

void checkSelectedRecords()
{
Student inventLocal;
;
//getFirst method gets all the selected records in the grid
inventLocal = Student_ds.getFirst(true);

while (inventLocal)
{
info(strfmt("You selected Item %1",inventLocal.Studentid));
// get the next selected record
inventLocal = Student_ds.getNext();
}
}

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void clicked()
{
super();
element.checkSelectedRecords();


}

check the buttons property multiselect :: yes or not.