I defined an enum in my App class:

public enum Panels
{
    Login,
    Welcome,
    ProjectInfo,
    Query
}

Then, in the base panel class I have:

private csCOSApp.Panels _PanelType;
public csCOSApp.Panels PanelType
{
    get { return _PanelType; }
    set { _PanelType = value; }
}

I get

Inconsistent accessibility: property type '...csCOSApp.Panels' is less accessible than property '....pnlBase.PanelType'

Why is this? Why can't I do this?