Declaration
protected override void InitializePanel(
ToolStripPanel toolStripPanel
)
Summary
Using just ToolStripManager.Renderer without setting the Renderer individually per ToolStrip means that the
ToolStrip is not passed to the Initialize method. ToolStripPanels, however, are. So we can simply initialize it
here too, and this should guarantee that the ToolStrip is initialized at least once. Hopefully it isn't any more
complicated than this.