“确定”和“取消”按钮不显示

为什么我的"确定"answers"取消"按钮没有显示在UI屏幕上？我看到了表单、标签和文本框，但看不到"取消"answers"确定"按钮。为了给你一个背景，我正在以编程方式创建这个对话框，我只需要几个文本框，当然还有它们的标签。以及"确定"answers"取消"按钮。

我在这里使用的所有这些尺寸都是经过反复尝试的，因为我在Visual C#2010的UI控制领域没有太多经验。

public void function x ()
{
    var fileNameDialog = new Form();
        fileNameDialog.Text = "Save New Name";
        Label fileLabel = new Label();
        fileLabel.Size = new System.Drawing.Size(150, 40);
        fileLabel.Text= "Enter Person Name";
        fileNameDialog.Controls.Add(fileLabel);
        TextBox fileTextBox = new TextBox();
        fileTextBox.Location = new System.Drawing.Point(fileLabel.Location.X + 300, fileLabel.Location.Y);
        fileTextBox.Size = new System.Drawing.Size(220, 40);
        fileNameDialog.Controls.Add(fileTextBox);
        fileTextBox.TextChanged += TextBox_TextChanged;
        fileTextBox.Text= textboxValue;
        Button okButton = new Button();
        okButton.Visible = true;
        okButton.Text = "OK";
        okButton.Location = new System.Drawing.Point(fileTextBox.Location.X, fileTextBox.Location.Y - 80);
        fileNameDialog.Controls.Add(okButton);
        okButton.Click += new EventHandler(okButton_Click);
        Button cancelButton = new Button();
        cancelButton.Visible = true;
        cancelButton.Text = "Cancel";
        fileNameDialog.Controls.Add(cancelButton);
        cancelButton.Click += new EventHandler(cancelButton_Click);
        cancelButton.Location = new System.Drawing.Point(fileTextBox.Location.X+50, fileTextBox.Location.Y - 80);
        fileNameDialog.ShowDialog();
}