add Widgets in widgets

[WingMan]

Hi,
my problem is to insert some widgets in one "main" widget (not MainWindow!).
I built a widget by using Qt designer (e.g. widget1) and created a class (widget2) to implement some functions for widget1.
In the next step I created a new widget (widget3) which has only a tableWidget inside.

My Problem is, if I create another widget (widget4) in which I want to place those two widgets (wiget2, widget3) there is nothing to see in widget4.

Here is my code of widget4:

require 'Qt4'
require 'Widget2'
require 'Widget3'
 
class Widget4 < Qt::Widget
	def initialize()
		super()
 
		@layout = Qt::VBoxLayout.new()
 
		@widget2 = Widget2.new
		@widget3 = Widget3.new
		@layout.addWidget(@widget2)
		@layout.addWidget(@widget3)
 
		setLayout(@layout)	
		size = Qt::Size.new(500, 500)
		size = size.expandedTo(minimumSizeHint())
		resize(size)
	end	
end

require 'Qt4'
require 'Widget2'
require 'Widget3'

class Widget4 < Qt::Widget
	def initialize()
		super()
		
		@layout = Qt::VBoxLayout.new()
		
		@widget2 = Widget2.new
		@widget3 = Widget3.new
		@layout.addWidget(@widget2)
		@layout.addWidget(@widget3)
		
		setLayout(@layout)	
		size = Qt::Size.new(500, 500)
		size = size.expandedTo(minimumSizeHint())
		resize(size)
	end	
end

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Hope u can help me,

THX
WingMan