'宣言 Public ReadOnly Property DropZoomFactor As System.Windows.Forms.ToolStripDropDownButton
'使用法 Dim instance As C1PrintPreviewControl.ZoomToolBar Dim value As System.Windows.Forms.ToolStripDropDownButton value = instance.DropZoomFactor
public System.Windows.Forms.ToolStripDropDownButton DropZoomFactor {get;}