you just want to use begin_editing() on your textfield or textview afte you present it. It not in the docs, so don't feel bad you missed it .
To set tab order requires a but more effort-- see:
https://forum.omz-software.com/topic/4562/set-next-field-for-tab/12
For your other question, you can either walk your way up and down the view heirarchy
sender.superview.superview['panel']['label5']
or, when you set up your textfield, or button, or whatever, you could add an attribute with some key piece of info
alternatively, using a custom view class for your main view lets you access the mainview via self.
class myview(ui.View): def __init__(self): self.label =ui.Label() self.add_subview(self.label) .... def textfield_action(self, sender): seld.label.title='hello'That way, there is one commin place for everything that any ui element needs to know.