# 4296 Clicking on Grid Column Header Separator at Design-Time Causes Invalid Reference Error

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I created a new project and put a grid on it. I added two columns. I changed the name of the column headers. I then clicked on the dividing line between the headers (as if I was going to try and resize them, though I wasn't) and got this error :

[Interface Manager Debug] Error dispatching design-time event for instance: Message: "GetSurface is an invalid reference" Stack Trace: Cursor in unit WebGrids at 1575,39