Okay, pasting into notepad didn't work - looks like the forum modified the post somewhat.
I've attached the diagram, along with the ASP markup and some screenshots demonstrating the problem: the first screenshot shows how the screen loads, the second how the screen looks after the splitter bar is collapsed, and thirdly how the screen looks when the user adjusts the width of the browser.
Kind regards,
Matt
Syncfusion Splitter Problem_4aade857.zip