how to link 2 interfaces ?

I am new to Basic4android software.
may i know how to link 2 interfaces togather when a click button is clicked?
what is the coding?
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mean that>> for example. i have a "choose" button. then when the "choose" button is clicked, in respond of the "choose" interface will pop out.
so what i wish to do is to link the " choose " interface with the "choose" button,
the interface will pop out when the "choose" button is clicked~
=D
 
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