Form creation issue with Controls/Widgets

[SBTec]

Hi Experts,

My requirement is to create a form that has widgets/controls like button,comboBox and textField on it horizontally but i am getting them vertically.
Suggest how can i achieve them vertically.

If i add a HStack on DynamicForm then some of the widgets like comboBox and textBox are not compatible in that situation. Where is the issue lies ?

Code snippet is as:

 import com.smartgwt.client.widgets.Canvas;
import com.smartgwt.client.widgets.form.DynamicForm;
import com.smartgwt.client.widgets.form.fields.FormItem;
import com.smartgwt.client.widgets.form.fields.CanvasItem;
import com.smartgwt.client.widgets.layout.HStack;
import com.smartgwt.client.widgets.layout.HLayout;
import com.smartgwt.client.widgets.Button;
import com.smartgwt.client.widgets.form.fields.ComboBoxItem;
import com.smartgwt.client.widgets.form.fields.TextItem;

public class Form extends Canvas {
	private DynamicForm dynamicForm;
	private Button btnDelete;
	private Button btnNewButton;
	
	public Form(){
		
		dynamicForm = new DynamicForm();
		dynamicForm.setRedrawOnResize(true);
		dynamicForm.setCanDrop(true);
		dynamicForm.setCanDragResize(true);
		dynamicForm.setCanDragReposition(true);
		dynamicForm.setCanDrag(true);
		dynamicForm.setCanAddFormulaFields(true);
		dynamicForm.setCanAcceptDrop(true);
		dynamicForm.setAutoFocus(true);
		dynamicForm.setAlign(getHoverAlign());
		//CanvasItem canvasItem = new CanvasItem("newCanvasItem_1", "");
		
		btnDelete = new Button("Del");
		btnDelete.setSize("50px", "22px");
		//canvasItem.setCanvas(btnNewButton);
		//dynamicForm.setFields(new FormItem[] { canvasItem});
		
		dynamicForm.addChild(btnDelete);
		ComboBoxItem comboBoxItem = new ComboBoxItem("newComboBoxItem_2", "");
		CanvasItem canvasItem = new CanvasItem("newCanvasItem_4", "New CanvasItem");
		
		btnNewButton = new Button("Add");
		canvasItem.setCanvas(btnNewButton);
		dynamicForm.setFields(new FormItem[] { comboBoxItem, new TextItem("newTextItem_3", ""), canvasItem});
		addChild(dynamicForm);
		dynamicForm.setRect(6, 6, 438, 288);
		
		
		
		
	}
}

Browser Version : Chrome 18.0.1025.168 m
SmartGWT Version : 2.5

[SBTec]

Desired requirement is attached herewith . Need suggestions