constants ViewOperationEnum
The ViewOperationEnum type specifies operations that could start or end. The ViewStartChanging / ViewEndChanging events notify your application that an operation starts or ends.  The ViewOperationEnum type supports the following values:

NameValueDescription
exSplitViewChange1 The user splits/resizes the view into multiple views.
exResizeCascadeColumn2 The user resizes the cascade column.
exSelectItemChange3 The control's selection is changing.
exSelectThumbnailChange4 The selects a thumbnail file.
exCheckStateChange15 The uses checks or un-checks the file.
exShowContextMenu20 Occurs when the control is about to display the object's context menu.
exExecuteContextMenu21 Occurs when the control is about to execute a command from the object's context menu.