In-game transparent window doesn't resize

Issue Description: I’m trying to create an in-game resizable transparent window, I realize some controls do not have built-in support (like dragging), however, according to the docs here it should have resizing support. I have set transparent and resizable to true, is there anything else that needs to be done to make it resizable?
Can you reproduce it (exact steps to reproduce): Yes, declare an in-game window as transparent and resizable,
Impact for my app: Trying to convert a non-transparent window into a transparent window for improved functionality.
Do you currently have a workaround? Nope