Layout problem with Table

Hey,

i have a problem with the layout of my table.

I have a vertical layout and i insert some compononents. At the End i insert a table and i will that this table fill. But i think i done all methods to fill this and i can´t find a solution.
I hope everybody can help me!

Here is my code:

Create layout:

/**
	 * creates the layout
	 */
	private void createMainLayout()
	{
		this.mainLayout = new VerticalLayout();
		this.mainLayout.setSizeUndefined();
		// this.mainLayout.setHeight("100%");
		this.mainLayout.setSizeFull();
		setCompositionRoot(this.mainLayout);
	}

Create Table:

/**
	 * creates the table
	 */
	private void createTable()
	{
		this.table = new Table();
		this.table.setSizeFull();
		this.table.setSelectable(true);
		this.table.setImmediate(true);
		this.table.addListener(new ColumnResizeListener()
		{
			public void columnResize(ColumnResizeEvent event)
			{
				processColumnResize(event);
			}
		});
		getLayout().addComponent(this.table);
		// getLayout().setExpandRatio(this.table, 1);
	}

And at least a screenshot that you can see my problem!