StackPanel pstkChannels = new StackPanel();
ScrollViewer svcr = new ScrollViewer();

for (int i = 0; i < t.Columns.Count; i++)
{
    CheckBox chkBox = new CheckBox();
    chkBox.Name = "chkChanDisp" + i.ToString();
    TextBlock k = new TextBlock();
    k.Text = t.Columns[i].ColumnName;
    //...
    chkBox.Content = k;
    chkBox.IsChecked = true;
    pstkChannels.Children.Add(chkBox);
}
svcr.Content = pstkChannels;
grChanDisp.Children.Add(svcr);