Please help - design support for Simple Texbox control in .Net Compact framework

[Mobile Boy 36]

I'm trying to make a very simple Textbox with a FocusColor property...When
the focus
changes to the
control, the backcolor must change automaticly to the color set by the
focusColor property.
Very simple, the control works fine when creating it dynamicly from code.

My aim is to add design functionality, so I can use it from the Visual
Studio .Net toolbox.
When I compile my code, no errors are reproted and Visual studio leaves a
dll in the release directory. (cdaTextBox.dll )
Even making a design time dll succeeded (design.cdaText Box.dll). To make
such a dll, I use the command line compiler csc.exe from within a batch file
'Build.bat'. Csc.exe does not report any errors.
But, and this is my problem, when I try to add the control to the toolbox,
Visual Studio fires an error:

There are no components in 'C:\Program Files\Microsoft Visual Studio
..NET 2003\CompactFra meworkSDK\v1.0. 5000
\Windows CE\Designer\des ign.cdaTextBox. dll' That can be placed on the
toolbox.

Can someone tell me what I have to change to my code to make it working?
This is the batchfile code (it runs well):

C:\WINNT\Micros oft.NET\Framewo rk\v1.1.4322\cs c.exe /noconfig
/define:NETCFDES IGNTIME /target:library /out:design.cdaT extBox.dll
cdaTextBox.cs AssemblyInfo.cs /res:DatAction.C ontrols.cdaText Box.bmp
/r:"C:\Program Files\Microsoft Visual Studio .NET
2003\CompactFra meworkSDK\v1.0. 5000\Windows CE\Designer\Sys tem.CF.Design.d ll"
/r:"C:\Program Files\Microsoft Visual Studio .NET
2003\CompactFra meworkSDK\v1.0. 5000\Windows
CE\Designer\Sys tem.CF.Windows. Forms.dll" /r:"C:\Program Files\Microsoft
Visual Studio .NET 2003\CompactFra meworkSDK\v1.0. 5000\Windows
CE\Designer\Sys tem.CF.Drawing. dll" /r:System.Window s.Forms.dll
/r:System.Drawin g.dll /r:System.dll /r:System.XML.dl l /r:System.Data.d ll
/nowarn:1595 >z.txt

This is My C# code:

using System;
using System.Data;
using System.Drawing;
using System.Windows. Forms;
using System.IO;
using System.Componen tModel;

#if NETCFDESIGNTIME
[assembly: System.CF.Desig n.RuntimeAssemb lyAttribute("Pi ctureButton,
Version=1.0.0.0 , Culture=neutral , PublicKeyToken= null")]
#endif

namespace Company.Control s
{
class cdaTextBox: System.Windows. Forms.TextBox
{

#region "Private data members"

private System.Drawing. Color mFocusColor = System.Drawing. Color.Blue;
private System.Drawing. Color mFocusTextColor =
System.Drawing. Color.Yellow;

private System.Drawing. Color mOriginalColor;
private System.Drawing. Color mOrinalTextColo r;

#endregion

#region "Properties !"
#if NETCFDESIGNTIME
[
System.Componen tModel.Category ("Colours"),
System.Componen tModel.Descript ion("This our colours")
]
#endif

public System.Drawing. Color FocusColor
{
get
{
return mFocusColor;
}

set
{
mFocusColor=val ue;
}
}

#if NETCFDESIGNTIME
[
System.Componen tModel.Category ("Colours"),
System.Componen tModel.Descript ion("This our colours")
]
#endif

public System.Drawing. Color FocusTextColor
{
get
{
return mFocusTextColor ;
}

set
{
mFocusTextColor =value;
}
}

#endregion
protected override void OnGotFocus(Syst em.EventArgs e)
{
mOriginalColor = this.BackColor;
mOrinalTextColo r = this.ForeColor;
this.BackColor = mFocusColor;
this.ForeColor = mFocusTextColor ;
}

protected override void OnLostFocus(Sys tem.EventArgs e)
{
this.BackColor = mOriginalColor;
this.ForeColor = mOrinalTextColo r;
}
}
}