private void initFrequencyBox(int xPos, int yPos)
{
frequencyLabel = new Label();
frequencyLabel.Font = new System.Drawing.Font(frequencyLabel.Font.FontFamily, frequencyLabel.Font.Size + 0.4f, System.Drawing.FontStyle.Bold);
frequencyLabel.Text = "frequency:";
frequencyLabel.Size = new System.Drawing.Size(75, 16);
frequencyLabel.Location = new Point(5 , yPos + 1);
frequencyLabel.Update();
frequencyLabel.AutoSize = false;
frequencyBox = new TextBox();
frequencyBox.Size = new Size(60, 20);
frequencyBox.Location = new Point(frequencyLabel.Location.X + frequencyLabel.Size.Width + 3, yPos);
frequencyBox.Text = synchronousPwmFrequency.ToString();
frequencyBox.TextChanged += new EventHandler(frequencyChangedHandler);
frequencyBox.KeyDown += new KeyEventHandler(frequencySettings_KeyDown);
fUnitsBox = new ComboBox();
fUnitsBox.Size = new Size(45, 21);
fUnitsBox.Location = new Point(frequencyBox.Location.X + frequencyBox.Size.Width + 3, yPos);
fUnitsBox.DropDownStyle = ComboBoxStyle.DropDownList;
fUnitsBox.Items.Add("Hz");
fUnitsBox.Items.Add("KHz");
fUnitsBox.Text = "Hz";
fUnitsBox.SelectedIndexChanged += new EventHandler(frequencyChangedHandler);
fUnitsBox.KeyDown += new KeyEventHandler(frequencySettings_KeyDown);
this.Controls.Add(frequencyLabel);
this.Controls.Add(frequencyBox);
this.Controls.Add(fUnitsBox);
}