Programmatically adding TableRow to TableLayout not working

Got it, every LayoutParams should be of android.widget.TableRow.LayoutParams except one that supplied to tl.addView(...)

/* Find Tablelayout defined in main.xml */
TableLayout tl = (TableLayout) findViewById(R.id.SaleOrderLines);
/* Create a new row to be added. */
TableRow tr = new TableRow(this);
tr.setLayoutParams(new TableRow.LayoutParams(TableRow.LayoutParams.FILL_PARENT, TableRow.LayoutParams.WRAP_CONTENT));
/* Create a Button to be the row-content. */
Button b = new Button(this);
b.setText("Dynamic Button");
b.setLayoutParams(new TableRow.LayoutParams(TableRow.LayoutParams.FILL_PARENT, TableRow.LayoutParams.WRAP_CONTENT));
/* Add Button to row. */
tr.addView(b);
/* Add row to TableLayout. */
//tr.setBackgroundResource(R.drawable.sf_gradient_03);
tl.addView(tr, new TableLayout.LayoutParams(TableLayout.LayoutParams.FILL_PARENT, TableLayout.LayoutParams.WRAP_CONTENT));

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