diff --git a/src/pocof/Library.fs b/src/pocof/Library.fs
index d22d3202..3041f58d 100644
--- a/src/pocof/Library.fs
+++ b/src/pocof/Library.fs
@@ -125,9 +125,7 @@ type SelectPocofCommand() =
     member val Prompt = "query" with get, set
 
     [<Parameter>]
-    [<ValidateSet("TopDown"
-      // , "BottomUp"
-      )>]
+    [<ValidateSet("TopDown", "BottomUp")>]
     member val Layout = string TopDown with get, set
 
     [<Parameter>]
diff --git a/src/pocof/UI.fs b/src/pocof/UI.fs
index 8fdc10f5..ef697cf5 100644
--- a/src/pocof/UI.fs
+++ b/src/pocof/UI.fs
@@ -61,20 +61,28 @@ module PocofScreen =
             line.PadRight __.rui.WindowSize.Width
             |> Console.Write
 
-        member __.writeTopDown
+        member __.writeScreen
+            (layout: PocofData.Layout)
             (state: PocofData.InternalState)
             (x: int)
             (entries: PocofData.Entry list)
             (props: Result<string list, string>)
             =
-            __.writeScreenLine 0
+            let basePosition, firstLine, toHeight =
+                match layout with
+                | PocofData.TopDown -> 0, 1, (+) 2
+                | PocofData.BottomUp ->
+                    let basePosition = __.rui.WindowSize.Height - 1
+                    basePosition, basePosition - 1, (-) (basePosition - 2)
+
+            __.writeScreenLine basePosition
             <| __.prompt + ">" + state.Query
 
-            __.writeRightInfo state entries.Length 0
+            __.writeRightInfo state entries.Length basePosition
 
             // PocofDebug.logFile "./debug.log" [ List.length entries ]
 
-            __.writeScreenLine 1
+            __.writeScreenLine firstLine
             <| match state.Notification with
                | "" ->
                    match props with
@@ -99,25 +107,22 @@ module PocofScreen =
 
             seq { 0..h }
             |> Seq.iter (fun i ->
-                match List.tryItem i out with
-                | Some s -> __.writeScreenLine <| i + 2 <| s
-                // logFile "./debug.log" [ s ]
-                | None -> __.writeScreenLine <| i + 2 <| String.Empty)
+                __.writeScreenLine
+                <| toHeight i
+                <| match List.tryItem i out with
+                   | Some s ->
+                       // logFile "./debug.log" [ s ]
+                       s
+                   | None -> String.Empty)
 
             __.setCursorPosition
             <| __.getCursorPositionX state.Query x
-            <| 0
+            <| basePosition
 
-        member __.writeBottomUp
-            (state: PocofData.InternalState)
-            (x: int)
-            (entries: PocofData.Entry list)
-            (props: Result<string list, string>)
-            =
-            // TODO: implement it from Write-BottomUp.
-            __.setCursorPosition
-            <| __.getCursorPositionX state.Query x
-            <| __.rui.CursorPosition.Y
+
+        member __.writeTopDown = __.writeScreen PocofData.TopDown
+
+        member __.writeBottomUp = __.writeScreen PocofData.BottomUp
 
     let init (rui: PSHostRawUserInterface) (prompt: string) (invoke: list<obj> -> seq<string>) =
         let buf = new Buff(rui, prompt, invoke, Console.TreatControlCAsInput)
diff --git a/tests/pocof.Tests.ps1 b/tests/pocof.Tests.ps1
index 091a508b..377e2da4 100644
--- a/tests/pocof.Tests.ps1
+++ b/tests/pocof.Tests.ps1
@@ -25,6 +25,24 @@ Describe 'pocof' {
             $_ | Should @p
         }
     }
+
+    Context 'Checking Select-Pocof parameters' -ForEach @{
+        InputObject = 'Hello,world'
+        Expected = 'Hello,world'
+        BaseParam = @{NonInteractive = $true };
+    } {
+        Context 'In <Layout> mode with empty query' -ForEach @(
+            @{ Layout = 'TopDown' },
+            @{ Layout = 'BottomUp' }
+        ) {
+            It "Given Layout '<Layout>', '<Expected>' should be returned." -TestCases @(
+                @{Params = $BaseParam + $_ }
+            ) {
+                $InputObject | Select-Pocof @Params -ErrorAction SilentlyContinue | Should -BeExactly -ExpectedValue $Expected
+            }
+        }
+    }
+
     Context 'Select-Pocof cmdlet' -ForEach @{
         InputObject = 'Hello,world'; BaseParam = @{NonInteractive = $true };
     } {