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.