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If the button ToolBarButton.Style is set to ToolBarButtonStyle.DropDownButton you can specify a System.Windows.Forms.MenuItem to be displayed when the drop-down button is pressed. If the style is set to ToolBarButtonStyle.Separator, the toolbar button appears as a button separator and not as a button. The ToolBarButtonStyle.ToggleButton style causes the toolbar button to act like a toggle button; it can be in an on or off state.