title: resize a uipanel without changing its children's sizes?
body: <p>suppose that I have created this panel and have modified sizes of the children to my favorable size.
  <img src="https://i.stack.imgur.com/GIHUw.png" alt="enter image description here"><br>
  Now I understand that there is some spare space at the bottom of the panel and since I have little space for other panels, I decide to cut this spare space.<br>
  But whenever I do all of the children get smaller and thiner!<br>
  I know that I can change size of the panel and then resize its children to my favorable size. But is there an easier way in order to not wasting time?</p>