无法更新TabPage文本

Question

由于某种原因，以下代码不会在运行时更新选项卡上显示的文本：

tabControl.TabPages[i].Text = newProps.plot_title;
//I tried these too but still no cigar
//tabControl.TabPages[i].Refresh();
//tabControl.Refresh();

我错过了一些明显的东西吗？

编辑：这是一个单线程WinForms应用程序。所以更新是在GUI线程上完成的。选项卡的内容更新没有任何问题。只有标签文本无法更新。完整代码：

    /// <summary>
    /// Show a dialog box to display and allow user to modify the plot's properties
    /// </summary>
    public void EditPlotProperties()
    {
       Graph_Properties currProps = plotControls[tabControl.SelectedIndex].cube.graphProps;
       PlotProperties propsWindow = new PlotProperties(currProps);

       if (propsWindow.ShowDialog(this) == DialogResult.Cancel)
          return;

       Graph_Properties newProps;
       propsWindow.GetGraphProperties(out newProps);

       if (newProps.IsEqual(currProps))
          return;

       LogFile.Instance.Write(MethodBase.GetCurrentMethod().ToString(), 
          "New plot properties:" + newProps.ToString());

       for (int i = 0; i < numPlots; i++)
       {
          if (i == tabControl.SelectedIndex || newProps.apply_all_plots)
          {
             plotControls[i].cube.graphProps.plot_title = newProps.plot_title;

             plotControls[i].cube.graphProps.x_label = newProps.x_label;
             plotControls[i].cube.graphProps.lower_x = newProps.lower_x;
             plotControls[i].cube.graphProps.upper_x = newProps.upper_x;

             plotControls[i].cube.graphProps.y_label = newProps.y_label;
             plotControls[i].cube.graphProps.lower_y = newProps.lower_y;
             plotControls[i].cube.graphProps.upper_y = newProps.upper_y;

             plotControls[i].cube.graphProps.z_label = newProps.z_label;
             plotControls[i].cube.graphProps.lower_z = newProps.lower_z;
             plotControls[i].cube.graphProps.upper_z = newProps.upper_z;

             plotControls[i].cube.graphProps.plot_size = newProps.plot_size;
             plotControls[i].cube.graphProps.channels = newProps.channels;

             plotControls[i].render();

             // TODO: for some reason this doesn't appear to update the tab text
             tabControl.TabPages[i].Text = newProps.plot_title;
             tabControl.Refresh();

             unsavedChanges[i] = true;
          }
       }
    }