popupmenu

How I can open a popupmenu when I click dialogbutton on formitem?

A popup menu or a popup dialog?

In desktop or web?

A “dialog button” is used to popup a “dialog”…

In desktop and web.
I need show a list with options.
I don't know when todo this with dialog.

Why not just use a Combobox?

Because I need execute another action, similar the postal code. But user need select the appropriate action.

Look at example_webapp1 dialog button delegate or use autosuggestions from a table.

Can I see the code used to create the sample below?
https://www.lianja.com/doc/index.php/Popupmenu

That is desktop specific.

I think what you are asking for is something new such as:

Lianja.showDropDownMenu("page1.section1.formitem1" , "one, two,three", function(itemSelected) { ... });

Submit an ER if thats what you need.