System.Windows.Forms.ToolStripDropDownButton looks like System.Windows.Forms.ToolStripButton, but it shows a drop-down area when the user clicks it. Hide or show the drop-down arrow by setting the ToolStripDropDownButton.ShowDropDownArrow property. System.Windows.Forms.ToolStripDropDownButton hosts a System.Windows.Forms.ToolStripOverflowButton that displays items that overflow the System.Windows.Forms.ToolStrip.

Use the System.Windows.Forms.ToolStripDropDownButton to activate familiar drop-down controls such as color pickers. Set the ToolStripDropDownButton.ShowDropDownArrow property to true to more clearly indicate to the user that further options are available on the drop-down list.