[Windows Mobile Apps and Games] laureus:
at the Moment i am facing a few problems with the map creator.

always promting the following error whenever i want to save:

************** Ausnahmetext **************
System.NullReferenceException: Der Objektverweis wurde nicht auf eine Objektinstanz festgelegt.
bei MapCreator.FrmMain.btnSave_Click(Object sender, EventArgs e)
bei MapCreator.FrmMain.lstLines_SelectedIndexChanged(Object sender, EventArgs e)
bei System.Windows.Forms.ListBox.OnSelectedIndexChanged(EventArgs e)
bei System.Windows.Forms.ListBox.set_SelectedIndex(Int32 value)
bei MapCreator.FrmMain.RefreshLineList()
bei MapCreator.FrmMain.btnAddLine_Click(Object sender, EventArgs e)
bei System.Windows.Forms.Control.OnClick(EventArgs e)
bei System.Windows.Forms.Button.OnClick(EventArgs e)
bei System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
bei System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
bei System.Windows.Forms.Control.WndProc(Message& m)
bei System.Windows.Forms.ButtonBase.WndProc(Message& m)
bei System.Windows.Forms.Button.WndProc(Message& m)
bei System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
bei System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
bei System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

************** Geladene Assemblys **************
mscorlib
Assembly-Version: 2.0.0.0.
Win32-Version: 2.0.50727.3603 (GDR.050727-3600).
CodeBase: file:///C:/WINDOWS/Microsoft.NET/Framework/v2.0.50727/mscorlib.dll.
----------------------------------------
MapCreator
Assembly-Version: 1.0.6.11.
Win32-Version: 1.0.6.11.
CodeBase: file:///G:/Daten/maps/MapCreator.exe.
----------------------------------------
System.Windows.Forms
Assembly-Version: 2.0.0.0.
Win32-Version: 2.0.50727.3053 (netfxsp.050727-3000).
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Windows.Forms/2.0.0.0__b77a5c561934e089/System.Windows.Forms.dll.
----------------------------------------
System
Assembly-Version: 2.0.0.0.
Win32-Version: 2.0.50727.3053 (netfxsp.050727-3000).
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System/2.0.0.0__b77a5c561934e089/System.dll.
----------------------------------------
System.Drawing
Assembly-Version: 2.0.0.0.
Win32-Version: 2.0.50727.3053 (netfxsp.050727-3000).
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Drawing/2.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll.
----------------------------------------
Accessibility
Assembly-Version: 2.0.0.0.
Win32-Version: 2.0.50727.3053 (netfxsp.050727-3000).
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/Accessibility/2.0.0.0__b03f5f7f11d50a3a/Accessibility.dll.
----------------------------------------
System.Windows.Forms.resources
Assembly-Version: 2.0.0.0.
Win32-Version: 2.0.50727.3053 (netfxsp.050727-3000).
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Windows.Forms.resources/2.0.0.0_de_b77a5c561934e089/System.Windows.Forms.resources.dll.
----------------------------------------
mscorlib.resources
Assembly-Version: 2.0.0.0.
Win32-Version: 2.0.50727.3603 (GDR.050727-3600).
CodeBase: file:///C:/WINDOWS/Microsoft.NET/Framework/v2.0.50727/mscorlib.dll.
----------------------------------------
System.resources
Assembly-Version: 2.0.0.0.
Win32-Version: 2.0.50727.3053 (netfxsp.050727-3000).
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.resources/2.0.0.0_de_b77a5c561934e089/System.resources.dll.
----------------------------------------