PFSplitter.NET

The PFSplitter-control is a collapsible splitter. This means that it has the ability to collapse or expand a docked control with a single mouse-click. Drop the control onto you form or UserControl and set the orientation to horizontal or vertical. After that, set the control you would like to collapse via the property ExpandingControl:

The splitter-control has Office2003, Office2007 and Vista-style. The colors of the gradients can be defined in the renderer and also the image of the expansion-state.