To change the Font of a Windows Forms Control like the “ToolStripButton” at creation time you can use this:

ToolStripButton btn = new ToolStripButton {
	Text = x.Name,
	Dock = DockStyle.Right,
	Font = new System.Drawing.Font("Segoe UI", 10.8F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)))
};