Let me clarify my query with some images.
This is how my current setup looks: https://i.sstatic.net/tyelv.png
Everything is contained within a table, where the boxes span the width of the table. However, I need the data field to expand across the full screen width under certain conditions due to potentially large content. It should resemble this: https://i.sstatic.net/JR52P.png
Adjusting the width of the data field also affects the table cell width, causing other cells' textboxes and listboxes to grow as well: https://i.sstatic.net/7XZsH.png
Is there a way to allow the data field to extend beyond the cell/table borders while keeping the cells at a fixed size? I've considered using positioning, but it hasn't been successful. Changing the table layout isn't an option since I'm just "cleaning it up" for someone else.