Write an OnCanResize event handler to conditionally prevent the user from resizing neighboring components using the splitter. 

The NewSize parameter indicates the size the associated control will have if the splitter is allowed to perform the resize. This value can be changed if the attempted resize can be partially allowed. The Accept parameter indicates whether the resize should be permitted at all. Set Accept to false to disallow any movement of the splitter. 

OnMoved 

ResizeStyle