I am really getting mad, I searched through jquery ui doc and stackoverflow\'s questions (tons of questions) but I cannot figure out how to manually act
Use the following to activate the last tab.
$("#stepBuilder").tabs({ active: -1 });
I've created an example for you on jsfiddle.net.
The API doc says about the activate
option:
active
Type: Boolean or Integer Default: 0
Which panel is currently open.
Multiple types supported:
Boolean: Setting active to false will collapse all panels. This requires the collapsible option to be true.
Integer: The zero-based index of the panel that is active (open). A negative value selects panels going backward from the last panel.