Visual Basic.NET - Error con Controles de Usuario

Hola, que tal. Estoy creando un control <NumericTextBox>, y me compila bien pero al jalarlo en un proyecto me sale el sgte. error:

Failed to create component 'NumericTextBox'. The error message follows:
'System.FormatException: Input string was not in a correct format.

at System.ComponentModel.ReflectPropertyDescriptor.SetValue(Object
component, Object value)
at
System.Windows.Forms.Design.ControlDesigner.InitializeNewComponent(IDictionary
defaultValues)
at
System.Windows.Forms.Design.TextBoxBaseDesigner.InitializeNewComponent(IDictionary
defaultValues)
at System.Drawing.Design.ToolboxItem.CreateComponentsCore(IDesignerHost
host, IDictionary defaultValues)
at System.Drawing.Design.ToolboxItem.CreateComponents(IDesignerHost host,
IDictionary defaultValues)
at
Microsoft.VisualStudio.Design.Toolbox.AutoToolboxManagerService.ToolboxManagerToolboxItem.CreateComponentsCore(IDesignerHost
host, IDictionary defaultValues)
at System.Drawing.Design.ToolboxItem.CreateComponents(IDesignerHost host,
IDictionary defaultValues)
at System.Windows.Forms.Design.OleDragDropHandler.CreateTool(ToolboxItem
tool, Control parent, Int32 x, Int32 y, Int32 width, Int32 height, Boolean
hasLocation, Bool...'

Creo yo que la primera linea es el problema, pero les dejo todo capas le encuentren algo. De tener la solucion les agradeceria la publicaran. Gracias de antemano.