Field in trailing grand summary placed unter field in body

I have a field A in the body of a table form, the form has a trailing grand summary, where is placed a field B. I want to place B under A. A and B are set with anchors TOP,RIGHT,BOTTOM,LEFT. Also if I resize field A, then field field B should get the same width etc.

I tried to group both fields, but that does not seem to work. Does anyone know, how I can realize it?

I have realized this behavior using the forms onRender method.

function onRenderForm( event ) {
	
	var x = 0,
		y = 0,
		height = 0,
		width = 0;
	
	x = elements.fld_gross_value.getLocationX( );
	width = elements.fld_gross_value.getWidth( );
	
	y = elements.fld_gross_sum_value.getLocationY( );
	height = elements.fld_gross_sum_value.getHeight( );
	
	elements.fld_gross_sum_value.setLocation( x, y );
	elements.fld_gross_sum_value.setSize( width, height );
	elements.lbl_gross_sum_value.setLocation( x - elements.lbl_gross_sum_value.getWidth( ), y );
}

Is it possible to get this bahavior without the method and through setting it in the form editor?