An easy way to do a super simple resizeable UI, I think, is to use splitter bars and then choose one pane that has some kind of big UI element that is easy to resize like a graph that you can just set as "size to pane". Then set the sticking of the splitter bars so that one pane is the only one that changes size on panel resize events and all others stay the same. Then you don't have to worry about scaling all the little buttons and dealing with decorations getting pixelated.
But for a tab control, yeah there is no easy way sadly (at least that I know of). For this, I usually just use radio buttons as the tabs and then a subpanel and switch out which VI is displayed in the subpanel based on the radio buttons.