var form = solutionModel.getForm("some_form");
form.defaultPageFormat = solutionModel.createPageFormat(792,612,72,72,72,72,SM_ORIENTATION.LANDSCAPE,SM_UNITS.PIXELS);

var form = solutionModel.getForm("some_form");
form.defaultPageFormat = solutionModel.createPageFormat(612,792,72,72,72,72,SM_ORIENTATION.PORTRAIT,SM_UNITS.PIXELS);

var form = solutionModel.getForm("some_form");
form.defaultPageFormat = solutionModel.createPageFormat(792,612,72,72,72,72,SM_ORIENTATION.REVERSE_LANDSCAPE,SM_UNITS.PIXELS);