3.2.0

how to put an action to a tree node

hello
I don't know how to put an action to a tree node
for example I have de tree
a
|_ b
|_x
|_y
|_c
|_1
|_2

and when I click b or x or any other node I want to put a function, for example to load something from a database [without changing the tree expansion]...
can you help me pls?
thank you
Dragos
November 15,
the function should make something depending on the node you click (for example if you click 'b' show some data, if you click x show some other data.. which depends on "b", "x",.. )
Dragos
November 15,

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