dxDockSite1.Width := 27;
dxDockPanel1.DockTo(dxDockSite1, dtLeft, 0);
dxDockPanel2.DockTo(dxDockPanel1, dtClient, 1);
dxDockPanel3.DockTo(dxDockPanel1, dtClient, 2);
dxDockPanel1.AutoHide :=true;
dxDockPanel2.AutoHide:=true;
dxDockPanel3.AutoHide :=True;