#25 Programm crashes editting text in textboxes

[Novan]

Every time I want to edit a text in one of the textboxes the programm crashes. If there is no text in the boxes and I want to write some text in the textboxes then every think work fine. But if there is already a text in the box and I want to edit it then I get the following error message:

------------------- Error Report -----------------

System.NullReferenceException: DObject reference not set to an instance of an object.
at ModFormControls.LocalisedTextBox.textBox1_MouseUp(Object sender, MouseEventArgs e)
bei System.Windows.Forms.Control.OnMouseUp(MouseEventArgs e)
bei System.Windows.Forms.TextBoxBase.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.TextBoxBase.WndProc(Message& m)
bei System.Windows.Forms.TextBox.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)

************** Loaded Assemblys **************
mscorlib
Assembly-Version: 2.0.0.0.
Win32-Version: 2.0.50727.832 (QFE.050727-8300).
CodeBase: file:///C:/WINDOWS/Microsoft.NET/Framework/v2.0.50727/mscorlib.dll.
----------------------------------------
ModStudio
Assembly-Version: 0.4.2760.32563.
Win32-Version: 0.4.2760.32563.
CodeBase: file:///C:/Programme/Mod%20Studio/ModStudio.exe.
----------------------------------------
System.Windows.Forms
Assembly-Version: 2.0.0.0.
Win32-Version: 2.0.50727.832 (QFE.050727-8300).
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: 2.0.50727.832 (QFE.050727-8300).
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: 2.0.50727.832 (QFE.050727-8300).
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Drawing/2.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll.
----------------------------------------
System.Configuration
Assembly-Version: 2.0.0.0.
Win32-Version: 2.0.50727.832 (QFE.050727-8300).
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Configuration/2.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll.
----------------------------------------
System.Xml
Assembly-Version: 2.0.0.0.
Win32-Version: 2.0.50727.832 (QFE.050727-8300).
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Xml/2.0.0.0__b77a5c561934e089/System.Xml.dll.
----------------------------------------
Phpbb.ModTeam.Tools
Assembly-Version: 1.0.2760.30015.
Win32-Version: 1.0.2760.30015.
CodeBase: file:///C:/Programme/Mod%20Studio/Phpbb.ModTeam.Tools.DLL.
----------------------------------------
ModFormControls
Assembly-Version: 1.0.2760.32563.
Win32-Version: 1.0.2760.32563.
CodeBase: file:///C:/Programme/Mod%20Studio/ModFormControls.DLL.
----------------------------------------
ICSharpCode.TextEditor
Assembly-Version: 2.0.0.1710.
Win32-Version: 2.0.0.1710.
CodeBase: file:///C:/Programme/Mod%20Studio/ICSharpCode.TextEditor.DLL.
----------------------------------------
System.Windows.Forms.resources
Assembly-Version: 2.0.0.0.
Win32-Version: 2.0.50727.42 (RTM.050727-4200).
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Windows.Forms.resources/2.0.0.0_de_b77a5c561934e089/System.Windows.Forms.resources.dll.
----------------------------------------
System.resources
Assembly-Version: 2.0.0.0.
Win32-Version: 2.0.50727.42 (RTM.050727-4200).
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.resources/2.0.0.0_de_b77a5c561934e089/System.resources.dll.
----------------------------------------
mscorlib.resources
Assembly-Version: 2.0.0.0.
Win32-Version: 2.0.50727.832 (QFE.050727-8300).
CodeBase: file:///C:/WINDOWS/Microsoft.NET/Framework/v2.0.50727/mscorlib.dll.
----------------------------------------
System.Data
Assembly-Version: 2.0.0.0.
Win32-Version: 2.0.50727.832 (QFE.050727-8300).
CodeBase: file:///C:/WINDOWS/assembly/GAC_32/System.Data/2.0.0.0__b77a5c561934e089/System.Data.dll.