help us to help you. add into code:
int x,y;
WebElement el = driver.findElement(By.xpath("//UIAApplication[1]/UIAWindow[1]/UIAPopover[1]/UIATableView[1]/UIATableCell[3]/UIASegmentedControl[1]/UIAButton[2]"));
x = el.getLocation().getX + el.getSize().getWidth()/2;
y = el.getLocation().getY + el.getSize().getHeight()/2;
System.out.println(x + ", " + y);
el.click();
and check that x,y coordinates are same as you expecting.