Font changed

When the font of a taskpanel group is changed the height of the captionbar is not changed. What is the solution to resize the captionbar also?

void CreateTaskPanel()
{
    
    TaskPanelGroup Group = wndTaskPanel.Groups.Add(ID.TASKITEM_SYSTEM_TASKS, "System Tasks");
    Group.Tooltip = "These tasks apply to your computer";
    Group.IconIndex = ID.TASKITEM_SYSTEM_TASKS;
    Group.Special = true;

    stdole.StdFont fnt = (stdole.StdFont)new stdole.StdFontClass();
    fnt.Name = "Verdana";
    fnt.Size = 35;
    fnt.Bold = true;
    Group.Font = fnt;