with (win = new Window("dialog")) { 
	with (add("group")) { 
		orientation = "row"; 
		alignChildren = ["fill", "fill"]; 
		with (group1 = add("panel")) { 
			orientation = "column"; 
			preferredSize = [500,-1]; 
			add_group(group1);  
		} 
		with (group2 = add("panel")) { 
			orientation = "column"; 
			preferredSize = [500,-1]; 
			with (add("statictext")) { 
				text="Panel2"; 
			} 
		} 
	} 
	with (add("group")) { 
		orientation = "row"; 
		alignChildren = ["fill", "fill"]; 
		with (group3 = add("panel")) { 
			orientation = "column"; 
			preferredSize = [500,-1]; 
			with (add("statictext")) { 
				text="Panel3"; 
			} 
		} 
		with (group4 = add("panel")) { 
			orientation = "column"; 
			preferredSize = [500,-1]; 
			with (add("statictext")) { 
				text="Panel4"; 
			} 
		} 
	} 
} 
 
 
win.show();  
  
function add_group( group1 ) {  
	var group = group1.add( "group" );  
	group.edit = group.add("edittext", [undefined, undefined, 200, 20], group1.children.length );  
	group.plus = group.add("button", undefined, "+"); 
	group.plus.onClick = add_btn;  
	group.minus = group.add("button", undefined, "-");  
	group.minus.onClick = minus_btn;  
	return group;  
}  
function add_btn ( e ) {  
	add_group( group1 );  
	win.layout.layout(true);  
}  
function minus_btn ( e ) {  
	if (group1.children.length>1) { 
		group1.remove( this.parent );  
		win.layout.layout( true );  
	} 
}