private static Viewport2D Create2D(Viewport2D.ViewDirection direction)
{
var viewport = new Viewport2D(direction)
{
Dock = DockStyle.Fill,
VSync = false
};
viewport.MakeCurrent();
GraphicsHelper.InitGL2D();
GL.ClearColor(CBRE.Settings.Grid.Background);
viewport.Listeners.Add(new ViewportLabelListener(viewport));
viewport.Listeners.Add(new Camera2DViewportListener(viewport));
viewport.Listeners.Add(new Grid2DEventListener(viewport));
viewport.Listeners.Add(new ToolViewportListener(viewport));
return(viewport);
}