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Combobox in vaadin grid

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I am trying to add combo box in vaadin grid using the below code:

And I imported version 1.0.3 for componentrenderer because I am using vaadin version7.6 and I added them by Build Path as shown in the attachment.
But the problem that the grid is appearing empty !
If removed the line

this.getColumn("Approval").setRenderer(new ComponentRenderer());

from the code, I am able to see the grid but I can not see the combo box as shown in the attached images.
Can someone advise me?

[Thumbnail for EmptyGrid.jpg]
[Thumbnail for GridWithoutCombobox.jpg]
[Thumbnail for BuildPath_ExternalLibraries.jpg]
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