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The ToolStripControlHost.DefaultSize property represents the System.Drawing.Size of the control when it is initially created. If ToolStripItem.AutoSize is true, the control is sized automatically in accordance with the System.Windows.Forms.ToolStrip orientation. You can manually adjust the size of the control by setting its ToolStripItem.AutoSize property value to false.
In order to maintain better performance, you should not set the System.Drawing.Size of a control in its constructor. The preferred method is to override the ToolStripControlHost.DefaultSize property.