Hou to press a button?

How to click a button from a program? Looks like the examples don’t work.
lv_event_send (btn1, LV_EVENT_PRESSED, 0);
This is wrong. Why?

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If you are looking to click a button you might want to use LV_EVENT_SHORT_CLICKED instead. This is effectively a press+release rather than just a press.

Thanks, but this command don’t working at all.

Instead, you need to use
The manual is outdated.?