Java Development Tools

hii guys i want to display a input field value in a pop up dialog box.
For this i have taken a input field, a pop up component and a button.
In the dialog box of pop up element i have taken an output text which will display the value of input field.
Everything seems to be work fine if i am giving the value to input filed at design time.
But when i want to display the input field value entered at run time, the dialog box of pop up displays nothing..!!!