[Gambas-user] Expander conditional Show

[M. Cs.]

Hello!
I am curious to know whether there are possibilities to make Expander's
expanding conditional.
There are defined event _Show(), which is happening between the mouse's
click and Expander's expand, and similarly the event _Hide().
But none of them offer possibility to intercept the opening/closure
conditionaly,

E.G: I would like to let Expander expand with click if exactly one item of
a list is selected. How to solve this?

Csaba