Check out the Picker class which does exactly that - it's a bit complicated but in the past I've used a stripped down version of the code to build e.g. a query generator.

On 04/04/2014 00:34, Gene Wirchenko wrote:
At 22:21 2014-04-02, Jean MAURICE <[email protected]> wrote:
<snip>
You could use two listboxes. One would start with a list of the pupils; the other would start empty. Select a pupil name and click on a move button to move the name to the other listbox. When done selecting, click on another button to process.

Sincerely,

Gene Wirchenko


[excessive quoting removed by server]

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