Hello,

1.       You could loop through of the collection of DockableControl panes, check the state and if the state is unpinned you can apply different size. You may try the following code snippet:

  foreach (DockableControlPane dcp in ultraDockManager1.DockAreas[0].Panes)
            {
                if (!dcp.Pinned)
                {
                    dcp.FlyoutSize = new Size(20,20);
                }
            }

2.       You can change the width, border style, and the appearance of the splitter but I think that this settings will apply to both, horizontal and vertical SplitterBars.

Change the back color:

ultraDockManager1.SplitterBarAppearance.BackColor = Color.Purple;

Change the width:

ultraDockManager1.SplitterBarWidth = 5;
Change the BorderStyle:

ultraDockManager1.BorderStyleSplitterBars = UIElementBorderStyle.Rounded4;

Sincerely,

Danko Valkov

Developer Support Engineer

Infragistics, Inc.