add button in getView() GridView
<p>I have tried to use the HelloGridView sample code.</p>

<p>I wish to add button to each grid. 
From the research, it seems i have to create buttons instead of imageviews in getView adapter method.</p>

<p>However, I have no idea how to create button in the getView() method. </p>

<p>Can anyone kindly show me how to create a button in the method?</p>

<p>thanks!</p>
