'宣言 Public ReadOnly Property HistoryPrev As System.Windows.Forms.ToolStripSplitButton
'使用法 Dim instance As C1PrintPreviewControl.NavigationToolBar Dim value As System.Windows.Forms.ToolStripSplitButton value = instance.HistoryPrev
public System.Windows.Forms.ToolStripSplitButton HistoryPrev {get;}