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public class Sample
{

//Hier eine ganz einfacher Datentyp
[CategoryAttribute("Name"),
CategoryDescription("Name of the Object")]
public string Name
{
get{return name;}
set{name=value;}
}

//Hier ein Color
[CategoryAttribute("Appereance"),
CategoryDescription("Color of the Object")]
public Color GeneralColor
{
get{return generalColor;}
set{generalColor=value;}
}

//Und hier schon mein Problem(chen) : 
[CategoryAttribute("Filename"),
CategoryDescription("Filename of the Object")]
public string FileName
{
get{return fileName;}
set{fileName=value;}
}

}                    

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propertyGrid.SelectedObject = instance_of_sample;