findViewById() returns null for custom component in layout XML, not for other components

Question

I have a res/layout/main.xml including these elements and others:

Answer 1

I had the same problem. My mistake was that: I wrote

        LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View layout=inflater.inflate(R.layout.dlg_show_info, null);
        alertDlgShowInfo.setView(layout);
        TableRow trowDesc=(TableRow)findViewById(R.id.trowDesc);

and as I used an inflater to "load" the view from an XML file, the last line was wrong. To solve it, I had to write:

TableRow trowDesc=(TableRow)layout.findViewById(R.id.trowDesc);

I wrote my solution, in case someone have the same problem.