Square cells in GridLayout (Vaadin 8.0.1)

Good day,
I'm a new in this framework. I want to create "bar ui" via GridLayout.

What I need:
I want to create Grid 3x3. Each of cell will contains different text fields (for example Label). I drawed it via java code. After launch I see columns with same width, but each row has own height. I do not want set "fixed" size of each cell - they should be dinamically resizable for different screens.

Is it possible create square cells with same height\width for all cells? Or GridLayout not for this situation?

Tatu Lund: I recommend to check this one

https://vaadin.com/docs/-/part/framework/layout/layout-gridlayout.html#layout.gridlayout.sizing.expanding

So if you set expand ratio of the each row to be 1, they shoud have a same height.

 

Thank you for reply. 
Each row has same height for all cells. But each row has own height. I want to create square cells with same height\width for all grid.

examples in attachments.

my code is

protected void init(VaadinRequest vaadinRequest) {
        generateMatrix(3, 3);
        setContent(mainGridLayout);
    }

    private void generateMatrix(final int columns, final int rows) {
        mainGridLayout.removeAllComponents();
        mainGridLayout.setColumns(columns);
        mainGridLayout.setRows(rows);
        mainGridLayout.addStyleName("grid-red");
        mainGridLayout.setSizeFull();
        mainGridLayout.setSpacing(true);
        mainGridLayout.setMargin(true);
        mainGridLayout.setColumnExpandRatio(0, 1);
        mainGridLayout.setColumnExpandRatio(1, 1);
        mainGridLayout.setColumnExpandRatio(2, 1);

        mainGridLayout.setRowExpandRatio(0, 1);
        mainGridLayout.setRowExpandRatio(1, 1);
        mainGridLayout.setRowExpandRatio(2, 1);

        Boolean[][] bars = {{true, true, true}, {true, true, true}, {true, true, true}};

        for (int column = 0; column < mainGridLayout.getColumns(); column++) {
            for (int row = 0; row < mainGridLayout.getRows(); row++) {
                if (!bars[column][row])
                    continue;

                String text = "<center>" + messageSource.getMessage("pages.index.bar"+column+row) + "</center>";
                Label label = new Label(text);
                label.setContentMode(ContentMode.HTML);
                label.setHeight("80%");
                label.setWidth("80%");
                mainGridLayout.addComponent(label);
                mainGridLayout.setComponentAlignment(label, Alignment.MIDDLE_CENTER);
            }
        }
    }