Adding ToolStripItem Dynamically and AutoSize

My application adds ToolStripItems to a ToolStrip dynamically, however the size of the ToolStrip is not always correct.  The ToolStrip's width sometimes falls short, creating the "extra" dropdown icon that displays the rest of the ToolStripItems.  I have tried both ToolStrip.Items.Add() in a for loop, and ToolStrip.Items.AddRange(), but this effect still occurs.

The ToolStrip is inside a ToolStripContainer, and the container is set to SuspendLayout, but I believe this property is so the controls won't jump around.

Any thoughts/ideas?