Resize All The Controls On The Form?

I have a program that has a TabControl on it. There is code to resize all the controls on the form when the window is resized, regardless of what tab is selected in the TabControl. My issue is that the form will only resize the controls on the selected tab. So if the window is maximized, for example, it will resize the controls on the selected tab, but if the user changes tabs, the new tab will still have the original, non-maximized sizes on it. This works the same with un-maximizing the form, the controls on other tabs will remain the size they are supposed to be when the form is maximized. Here's some example pseudo-code to give you an idea. Assume button1 is on tab1 and button2 is on tab 2.

sub form_resize()
button1.width = x
button2.width = x2
button1.height = y
button2.height = y2
end sub

So the code is supposed to resize all controls regardless of the tab. But if tab 1 is selected it will visually resize button1 but it wont resize button2. To counter this, I simply made the form resize by 1 pixel and then move back to the original size when the user changes tabs. BUT this wont work for maximizing/un-maximizing the form. I tried telling it to detect window state on tab select so if the form is maximized, it will un-maximize it, perform the resize, and re-maximize the form but this doesnt seem to work.

automate this somehow so that regardless of selected tab or window state, all controls will be resized to the proper, current form size?