Fix enabled "Open" button with no focused session.

source/connections.dfm

@@ -54,6 +54,7 @@ object connform: Tconnform
     Anchors = [akRight, akBottom]
     Caption = 'Open'
     Default = True
+    Enabled = False
     TabOrder = 5
     OnClick = btnOpenClick
   end

source/connections.pas

@@ -392,6 +392,7 @@ begin
   btnNew.Enabled := SessionExists;
   btnSave.Enabled := not SessionExists;
   btnDelete.Enabled := SessionFocused;
+  btnOpen.Enabled := SessionFocused;
   FSessionModified := False;
   FSessionAdded := False;
   ListSessions.Repaint;