but there is nothing happen....please help me...
Impossible to help without seeing all the
relevant code. To get better help sooner, post a
SSCCE (Short, Self Contained, Compilable and Executable) example that demonstrates the problem.
And I second Campbell's advice: most applications are best designed with only one JFrame, and other UIs as JDialogs, commonly modal.
edit Your initComponents() call implies that you are using a visual designer -- definitely not a beginners' tool. Is that guess correct?