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#### hello world (GUI, with vbox)

Create a new action hello() that prints "Hello world!" in vertical layout in a dialog box.

##### Example implementations

awk | bas | fawk | lua | pas | pl | py | tcl

##### Explanation, step by step

Create a function hello that will be registered as an action.

When the action is called, build a dad dialog called "heldi", with a vertical box that contains two labels "Hello" and "world!" and standard dialog box close buttons . When the cancel button is clicked, the dialog box will return -1; clicking the ok button will return 0. The vbox is closed by a "end" call to dad(). When the dialog is ran in modal mode, it will be open and block other pcb-rnd windows until the user closes it.

Tip #1: change "begin_vbox" to "begin_hbox" to get a horizontal layout.

Tip #2: boxes can be nested (but each box must have a corresponding "end").

In the "main" section of the script, register the action using fgw_func_reg().

More details on DAD: DAD developer's doc