Damn, another problem...

How can i change properties of items? I have three items on my form:
pushbutton named knefel
label named label1 and
text field named text1.

I would like to copy a text from text1 to label1 when 'knefel' is pressed.
In builder i would type
label1->text = text1->text
but it doesn't work here.

How can i "call" items in qt?