// Author Christian
public void RemoveProductGroupExecute(object parameter)
{
ShownProductGroups.Add(DtgSelectedProductGroup);
ProductGroups.Remove(DtgSelectedProductGroup);
NotifyPropertyChanged("ShownProductGroups");
NotifyPropertyChanged("ProductGroups");
}
// Author Christian
public void AddProductGroupExecute(object parameter)
{
ProductGroups.Add(CbxSelectedProductGroup);
ShownProductGroups.Remove(CbxSelectedProductGroup);
NotifyPropertyChanged("ShownProductGroups");
NotifyPropertyChanged("ProductGroups");
}