In order to open the form as a floating document, you can use the DockWindowAdded event and set the HostWindow.DockState property to Floating:
Private Sub RadButton1_Click(sender As Object, e As EventArgs) Handles RadButton1.Click
AddHandler Me.RadDock1.DockWindowAdded, AddressOf DockWindowAdded
Dim frm As New RadForm1()
Me.RadDock1.DockControl(frm, DockPosition.Left, DockType.Document)
RemoveHandler Me.RadDock1.DockWindowAdded, AddressOf DockWindowAdded
End Sub
Private Sub DockWindowAdded(sender As Object, e As DockWindowEventArgs)
Dim hw As HostWindow = TryCast(e.DockWindow, HostWindow)
If hw IsNot Nothing Then
hw.DockState = DockState.Floating
End If
End Sub
To hide all the buttons on the window
oDocumentWindow.DocumentButtons = 0