the popupwindow and the original view all get focus

Question

I make a project which there are some buttons in the bottom,when i click one of the button,there will be a popupwindow created,there are more buttons in the popupwindow,but i can not click the buttons in the popupwindow because the popupwindow does not get the focus.If i use the function setfocus,i can not click the buttons in the original view.How can i click all of them.Thanks!