public static DeleteDialog getDeleteDialog(MatrixTreeNode[] nodes) {
public static DeleteDialog getDeleteDialog(MatrixTreeNode[] nodes, Point locationOnScreen, Dimension treeDimension) {
	public static DeleteDialog getDeleteDialog(MatrixTreeNode[] nodes) {		DeleteDialog deleteDialog = null;		if (!MatrixDialog.hasDialog(DeleteDialog.class)) {			deleteDialog = new DeleteDialog(nodes);			MatrixDialog.putDialog(deleteDialog);		} else {			// bring the selection dialog to the front			deleteDialog = (DeleteDialog) MatrixDialog.getDialog(DeleteDialog.class);			deleteDialog.toFront();		}		return deleteDialog;	}