You can use this method to switch the combo between its dropped down and closed up states. If the combo is closed up, it will drop down when you invoke this method. If the combo is dropped down, it will close up when you invoke this method.
To determine the current state of the control, use the UltraDropDownBase.IsDroppedDown property.
Me.UltraCombo1.ToggleDropdown()
this.ultraCombo1.ToggleDropdown( );
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2