initialize a class from a partial class

I am trying to initiate a class to use it's attributes and method from another class, but the class has 2 constructors(1 with parameters, and one without). the one without parameters it is finding ok, the one with parameters it is not seeing it. it is because it is a partial class?

this is the code:

public partial class ScenarioEditorView : UserControl, IScreenSelectorSubItem, IActionable, INotifyPropertyChanged
   {

        string p1 = "";
        string fullp = Path.GetFullPath(p1);
        ScenarioEditorViewModel viewModel = new ScenarioEditorViewModel(fullp);
}

fullp is unknown.

please help

Tags: C#, WPF, Partial