I have two files holding partial classes, but method sendMessage and field dte are not recognized in the second file.

I’m not sure if it is because it is a WPF component.

namespace MyNamespace
{
    public partial class RefactorControl 
    {
        public async System.Threading.Tasks.Task saveAllFilesAsync()
        {
            sendMessage("Saving all files");

            await ThreadHelper.JoinableTaskFactory.SwitchToMainThreadAsync();
            dte.Documents.SaveAll();
        }
    }
}

In the other file, these are defined

namespace MyNamespace
{
    public partial class RefactorControl
    {

        private DTE dte;

        public void sendMessage(string message)
        {
            ...
        }
    }
}

am I missing something?