Very simple CVI-progra​m and question

Hi
I have just started working with CVI and, as far as I can see, the principle behind the interaction between various elemements is similar as in Delphi. I have made a very simple example (User Interface Application), containing a square command button and a numeric. My idea was to push the button, whereafter the NUMERIC-control displays some number. However, I can't seem to figure out how to construct change the function that is executed when pushing the button. I tried double-clicking, right-clicking, etc.., but I couldn't figure it out. I hope my question makes sense.
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I searched for litterature, but only found the Programmer Reference Manual (http://www.ni.com/pdf/manuals/323643a.pdf). The litterature you suggest seems very relevant, I'll take a look at it. Thanks.

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