如何在iOS中的UIWebView中添加添加UIButton

i have small doubt.. i am displaying uiwebview dynamically based on json response. i need to add uibutton in uiwebview. so i am adding uibutton in uiwebview. But the uibutton should display only first uiwebview. remaining webviews does not display uibutton.i took uiview as a superview. and uiwebview adding subview of uiview. and finally uibutton is adding subview of uiwebview .i am writing my code like this. help me any body..i have small doubt.. i am displaying uiwebview