You can do it using setCaption but to get it to lineup on the right next to minimise you'd need to either use a number of ' 's or maybe it can be lined up using css? If you allow your grid to be resized then that's another thing you would have to handle in some way.
$(“#mygrid”).setCaption('My Caption ' + '');
… adds an image button a few spaces after the text 'My Caption' for example.
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