How can I display a multiple grid panels into columns of grid panel

I have a GridPanel "grid". It is set to four columns.
And I have Gridpanel elementGrid in which I have components such us button ,OutputText ,.. .And I load the gridPanels elementGrid into "grid" using this.
List<UIComponent> childComponents=new ArrayList<UIComponent>();
for (int i=0;i<count;i++) {
   HtmlPanelGrid elementGrid = new HtmlPanelGrid();
   HtmlCommandButton button = new HtmlCommandButton();
   HtmlOutputText txt=new HtmlOutputText();
    elementGrid.getChildren().addAll(this.childComponents);
    grid.getChildren().add(elementGrid);
}The contents of "grid" is dislay in only one column.
But I want that each elementGrid is displayed in a cell .So I want to have multiple columns.
How can I do please.
Thanks in advance.

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